My FIL found two of the commerative Epcot tickets that his mother purchased during a trip many years ago. They look like this ticket. He and his DW are going with me, DW and DS to WDW in December and he wanted to know if he could use these tickets. They are 3 day tickets and have not been used. I told him it was my understanding that those tickets could be traded in for 3 day MYW tickets that he could then add park hopping to for $35 each. Is this correct?