I have a 1989 4-Day Worldpassport with two days left. This is a ticket that was hand stamped at the gate. The 3rd and 4th days are unused. It does state on the ticket that "To be VALID, this Worldpasspost must be used by the SAME PERSON for ALL DAYS." The back of the ticket indicates that admission was for Magic Kingdom and Epcot Center. I am wondering what trade value the ticket will have.