In 9320, the Confederacy of Humanity began reviewing its policies towards contact with extraterrestrial life. This required going through millennia-old files dating all the way back to 1700 CE. They found evidence of alien visitations that were covered up by governments, and reports of legitimate abductions dating all the way back from 1830 CE onward. Even the famous "Roswell incident" of 1947 CE was caused by an alien craft that had crashed after suffering a propulsion system malfunction, and when the news leaked out to the race of aliens that were piloting the craft, they were outraged. How can these...beings call their highly sophisticated craft a "weather balloon"? But the most intriguing thing they found was in 1977; the file stated that NASA had launched a pair of space probes with the purpose of "studying the outer Solar System." They also found incredibly low-quality photos of Saturn, Jupiter, Uranus and Neptune. Also, the file spoke of a "golden record" affixed to both craft, "in case extraterrestrial life ever found them".
Unfortunately, exact location data for the two crafts has not been available since 2098, when their Radioisotope Thermoelectric Generator units ceased producing detectable amounts of electricity. Therefore, only severely outdated course and speed info was available. According to the mission profiles, they were currently somewhere in the Oort cloud, and both Voyager I and 2 were headed in the general direction of Gliese 445, and Ross 248, respectively. Knowing the implications of a retrieval mission, and what it would mean for Humanity, the Confederacy of Humanity began planning one in 9322. They named this mission "Operation Voyage Home."
One issue they ran into is trying to figure out where the probes actually were, since exact location data was lost millennia ago. Compounding the situation was an error margin of 5 degrees in all directions, and a location margin of over 5 million kilometers centered on what was assumed to be the crafts themselves. Also, their Radioisotope Thermoelectric Generators would be far too weak, if they gave any energy at all, to be detectable. Computer estimations have shown they would still give off electricity, but this would be very weak; on the order of 1/1,000,000th of a watt or less.
The first mission launched in 9323 and resulted in failure. The shipboard computer could not get a fix on the location of the craft, and misidentified other alien probes as the genuine article. Most likely this was because of the nature of the Voyagers; tiny craft by comparison to current ships. The second mission was a failure also as it was found out that the ship computer could not identify millennia-old space probes, and this was also the reason for the failure of the first mission.
One minor update to the software is all that was needed to narrow down the locations the two Voyagers might be. Now it had the ability to zero in on objects as small as 1 meter wide. The third mission failed also however, but that is because the ship overshot the target and the captain in charge of the mission could not find it again. The Confederacy hit the jackpot with the 4th mission however. The shipboard computer returned a ping that was followed, and eventually lead to Voyager I.
For such an ancient craft, it was remarkably well-preserved. It was carefully beamed aboard the vessel, and was examined. It seemed to be in pristine condition still, thanks to the vacuum of space. Looking at its ancient memory chips, it seemed that the cold had finally done them in - electronics at the time were not designed to handle temperatures close to absolute zero. Still, an attempt was made to retrieve any data they may still contain. One very badly corrupted picture was retrieved from the memory chips, and seemed to show an outline of something. An alien ship, maybe?
Using the information from the monumental find, the 5th mission was supposed to have found Voyager II. Yet, they didn't see a trace. This was odd, considering the vallant success of the other mission. The search team kept looking for a few months, but found nothing yet again. By now, estimates told the crew that Voyager II was to be tractored aboard the ship around that day, which just made crew members more frustrated. Where could the probe have gone? In a last ditch effort, a section of the crew beamed out messages to major, and close-by civilizations, about a missing probe. A few of them in many dotted areas responded, so this potentially means that they could have stolen it.
The researchers decided that looking for Voyager II for a few more years was pointless. On the other side, Voyager I was being returned to Earth, and spruced up. It now stands at the Confederacy of Humanity headquarters, in a park designed specifically for this probe. The Golden Record was also removed and placed in a separate exhibit. Modern researchers deciphered the messages with ancient machinery, listening to sounds from millennia ago. A few scientists gazed in happiness, as it seemed to be all safe.
While this whole research ordeal was happening on Earth, a few lone crew members went in a large pod, and searched for the real answer, on what happened to Voyager II.
As for Voyager II, it is unknown what, or who stole the probe. Calls were put out by some of the Confederacy's scientists to find the probe again, and communicate with it to find out exactly what had happened to it. The only clue of its existence today would be from alien historical logs. That still offered very little help, as this bubble accounted for literally every star-born civilization. They soon narrowed it down to the Andromeda area within 7 years, through heavy investigation, though.
A few months later, after scanning M110 repetitively, the searches for potential civilizations to know the whereabouts of Voyager II came down to a close. In the listings, there were 31 potential civilizations that knew what had occurred to the probe. After extensive looks into all of their historical files, The results from the Federation of Lo'Xal came as the most plausible. These files happened to be about a small scouting ship that discovered a probe from a young civilization. The ship reportedly decoded all messages, and sent all of the relics to a museum. It was simply a matter of traveling to said museum to find out that Voyager II's messages stood.
As the Xa'Thin scientists story goes, a scouting ship apparently found Voyager II while on the edge of the Oort Cloud. They then happened to take the messages, coat the probe with new technology, and a special type of transmitter that only a few civilizations could have access to. This is likely why The Confederacy couldn't find it. After some final searching with Xa'Thin pilots and historical experts, they ended up finding Voyager II, all in the dark, with advanced computers. Finally. It was soon beamed on the ship, and sent to a Xa'Thin-Human museum on Mars. The original Golden Record ended up being recited to the Human crew members, and it with the plaque were also brought to Mars.