I believe that fairytale package includes "Length of Stay" (or whatever the phrase of the day is). These are right on your room key. Room keys are given a credit card type number for charging that than ends in 1 - ?? based on the party size. If Oldest child losses the key, you go to your front desk and they cancel out card 03 (thus voiding the pass) and issue you a new one now ending with 05 (for example). Therefor, you don't need copies. I know some hotels have business centers but I am sure if it is just one copy of the back of tickets, the guest services desk or front desk at your resort will do it for you.
Good luck
Sandy