anybody know circuit city return policy, serial number question

[STARSCREAM]

Anyone know if circuit city checks the serial numbers somehow when returning or scanning it in to the computer when you buy?? I'm asking because I bought an 805 there and the serial number on the back of the receiver does not match the one on the box. I now wonder if I got someones switcharoo or open box or something. I hope this won't be a problem for me returning it because the Audyssey feature won't work, always says "writing error".