You mean the 5803 right? To my knowledge the reciever that replaced my Denon (the 5800) was the 5803 (which only added an upgrade I/O panel making it THX Ultra 2 complient rather than THX Ultra). Definately look inside throught the vents to make sure it looks real (ask for a manual, reciept, and registration information such as a serial number)... Also try it out carefully (listen to music fairly loudly and try out all 7 channels and make sure the delicate remote is OK).
Sounds very sketchy...
Good luck.
