I have had 2 tool related items for sale recently on the site, and an interested party agreed to purchase them.  He sent me a check from citibank for $1,700 for the items which I had agreed to sell him for $350.  He wants me to cash the check then send him the parts and he will tell me how to send him back the extra money.  The check came to me in a US Postal Service Priority Mail Envelope with the following return address Hazleton Town Hall, 101 S Main St., Hazelton, IN 47640.  He has been corresponding with me by email using the name Jose Fernandez.  His email address is rodneycar23@gmail.com.  I have not cashed the check but told him I would accept PayPal when I became suspicious.

What would you do?