This almost happened to a co-worker last year. Almost identical...the only thing is my co-worker asked for a phone number, and the business license number of the shipper and the shippers address, so he could have them investigated before any further discussion....he got one more email that said 'F**** You!' and that was it. My co worker was glad about 5 of us ragged on him until he sent the email about investigating the shipper....
Bottom line, stay away from these kind of transactions.