I think Amazon won't release the payment unless buyer received the product and atleast waited a week in case of any dispute so don't think this is money scam.Is this something like a scam type like Harshad Meheta type, Money in the account for 10-12 days for shorting share - Control over Investment / Money market / bit coin exchange.
Other possibility could be the buyer info, this way seller gets full access to Name/Email/Address/Phone/(Payment method, so he knows you have an account in such bank or XX card - I might be wrong about this though)