On site today and attempted to use a pair of 10-day PH NE tix purchased in 2015. Entered the codes on the tickets and assigned them to me & DW. Couldn't see them in MDE with my other tix. Guest services said they could see them but they were "locked" since they were so old. They needed to see some type of proof that they were in fact my tix. Fortunately, I had the paperwork from my purchase thru
Undercover Tourist from nine years ago that I had saved with the tix. Not sure what would have happened if I didn't have that paperwork.