Give me an example and I'll be happy to provide something along those lines
Here's two suggestions....
#1
The "coup de grĂ¢ce" would be a snap shot of Mr. Van Dyke autographing this machine. Of course we know he's a busy guy and may not be able to schedule for such a shoot.
#2
Perhaps a less reliable but more convienent idea would be to make a phone call. Could you provide a .avi or .wma audio clip of Mr. Van Dyke confirming your possesion of his 4000? Unless you have a professional voice impersonator, I think his distint voice confirming you and the machine would be enough for me.
The fact you've come over to discuss the situation has alreay boosted your credibility, but any one looking to spend perhaps a couple thousand dollars will probably like more proof.
Plaz