As part of the sale of a rolling AA frame to a buyer from Texas, I had to provide a "title."
Title in NH is pretty simple - provide a bill of sale identifying the VID, provide VERIFICATION of the VID on the actual vehicle. If a previous registration in your name exists (It didn't for me on this) then that can be used in lieu of the Bill of Sale.
Using the BOS, I arranged for an "authorized inspector" to come to the house and verify. Nice local female police officer - well uniformed - and totally unaware of the engine or frame numbers on a Model AA antique chassis.
I was fortunate that both engine and frame matched on this 26K chassis (with the body removed.) But I simply showed her the engine, without telling her about the chassis number.
I think had I showed her the chassis number instead, she would have been content with that?
Talking with her afterwards I asked "what would you do if you didn't have a number stamped ANYWHERE? (Which would be the condition of my "other" Model A truck - chassis number obscured, engine number block BLANK. - ("Allstate" Engine painted red. )
"Well, as long as you have a permanent plate stamped and mounted somewhere near the engine, matches the BIS, and available for inspection by lifting the hood, that would probably be OK. "
In the case of my other truck, I had an expired registration from Massachusetts - which showed A number. It does match the chassis.
At least in this state they give you some slack based on "demand" on the body style. Antique trucks not so much in demand. Were it a Lamborghini, I imagine it would be a different story.
Joe K