Carrie - It depends on what is on the AAA reciept. I know that the WDW ticket agents that don't actually PRINT the tickets are giving a second receipt with the tickets that has the ticket code on it. If AAA doesn't do this, it's going to be tough.
On the receipt, look for anything that would pertain to WDW on it. Such codes as WMK, WTS, WDR, WNR, WST, WEC and then dates and numbers. If they have that - maybe! I can't tell you for sure without actually seeing it.
Good luck!