Shop I work at sees this all the time. A long ago pre-order comes in finally, we call to find bad phone numbers, expired credit cards, customers moved, customers expired.
The longest I've dealt with was HO scale tractors announced by Athearn, announced 13 years ago delivered in 2022. People that did their PO that we were able to contact couldn't remember ordering them, but 95% still took the orders. What didn't get claimed were sold in less than a week.