Hey there, was this the 'white' rarity version of 'Allstar Vector'? This was a quest item tied to the 'Drop In' quest - it was given at the same time as when you picked the quest up, and like the quest itself, it too had an expiry date of the end of Guardian Games. Completing the quest would have upgraded the skimmer to its complete form, in Exotic rarity, and this version is the permanent one. There was no engram to decode, the old version of the skimmer simply changed into the upgraded one. Completion of 'Drop In' required 1,200 points worth of medals, or a top 10% Nightfall score, or opening three focused playlist winner awards, so a raid, even the best raid ever, wouldn't have contributed anything to these except for a few silvers and maybe a Platinum medal from one of Eva's cards (less than 20 points total). It was not a quest that would be completed casually, it's something you'd need to work on.