I just got our 6 day park hopper tickets in the mail and am concerened by them a little. I got them through what seems to be a reputable company but they looked alittle 'old' so I checked the back and their dated 8 of 2001! Are these valid? I'm a little worried to say the least. They do not look used at all, just like they've been sitting in a ticket pile for awhile.