The bill of sale will identify the buyer and the seller, describe the boat being sold, and recount the circumstances of the transaction. A Pennsylvania boat bill of sale is a document used to demonstrate a finalized transaction between a boat seller and buyer.Bill of sale or invoice with names and addresses of the seller and purchaser and the legal owner, if different from seller. You need to fill out and sign Section A. The buyer fills out Section D. Both Sections need to be notarized. A bill of sale is recommended if you're buying a motor vehicle, boat, or livestock. In PA, if the boat had previously been unregistered for more than two years, you can register without prior owner's info.