^^^ Have to agree with the above poster, how do you lose the receipt in 4 days, especially if you think you may return it later (which is obviously the case here).
Further, think about it. TRU has had many discounted deals lately, w/o a receipt they have no idea if you really paid $60, or if you even bought the game @ TRU. It's not on TRU to prove your undocumented purchase. Your only hope is if you purchased with a credit card, and going back to the same store where you purchased.