If it's too good to be true....

I am currently looking at two listings from the same person (same manufacturer too)on AudioGon classifieds, CD player and Integrated amplifier. Stated "like new", they each are being sold for about $600 less than retail. Latest model's too. Person's rating for transaction is high (100+). So what's the problem? Possibly class "B"? Are all Audiogon Classified lister's on the up and up? What should I be aware of?

Thnx.