Thanks everyone for your responses. I was the anonymous, original poster with the question. It was a sincere question since it was a true situation for me. Sometimes I find even tho I am a banker, it is good for me to step back when I am a consumer, and gain other banker's perspectives.
I did take your advice and e-mailed the potential buyer that I would need to send the cashier check in for collection and it would take app. 10 - 30 days before I would release any funds or my car. Guess what. I never heard back from the individual.
Also, his excuse for wanting to send more funds then what the selling price of the car, was that the check was issued to him from his client to also cover the shipping costs, etc. So in all reality, I also would have been the "last" endorser on the check.
Thank you all for helping me "sort" it out. As bankers, we have "sound" judgement, as consumers, it is a scary world. I wish all consumers could read your responses. They were excellent "words of advice."
This also gave me an avenue to allow my husband to see other banker's advice, not just mine. He then understood where I was coming from.
Thank you!!