OK, so after doing some research and confirming with a few p.. (OnlyFans)

OK, so after doing some research and confirming with a few people who bought the set it looks like it isn't missing, only moved from the DMs b/c it was no longer an active offer for those who didn't purchase it. The way OF organizes your purchases is under the "purchases" tab from your home screen. Everything should be there. See picture for example :)