Pay vehicle sales tax, prove the sales tax was paid or prove that a vehicle registration is exempt from sales tax. A One Time Showing Agreement is a commission agreement signed between a buyer's agent and a seller for specific named buyers.If you recieve Medicaid through your local department of social service (LDSS), you may fill out form DOH-5247 and submit this with your renewal. Simply go to where you bought the car. That is unless you bought it off an individual then your title becomes your proof of sales or what your bank provides. Start the new car buying process and find a Costco Auto Program Approved Dealer near you. Select your new vehicle and enter your membership info to begin. You must complete, sign and submit a Notice of Sale to our office within 30 days of selling a vehicle, vessel or mobile home. The Listing Agreement contains provisions that are substantively unfair to a seller. (discussed in Parts II and III).