You MUST have all customers sign their invoice upon picking up AND return the invoices to us in order to be paid for your sale. After the bidding closes, the customer invoices will be available to print. Follow the steps in the Welcome Guide video to locate and print. After your pick up is complete, you can deliver the invoices to our office or mail them to us. Our address is 1865 New Highway Unit D Farmingdale NY 11735.