Won "Lost and Found" in a quest tonight. Went to move it to my vault and it says the item isn't there. Glitch or part of the Lost and Found?

check here to make sure it didn't get moved somewhere by accident. if it is missing, file a ticket and they should be able to help you find out what happened

Thanks for helping. I'll just keep the three on my vault and try for more. Would have been funny to have it disappear for a while in keeping with the Lost and Found.