The frame on my '75 Commando has a unique Vehicle Identification Number stamped on the right-hand side of the steering head stock. Texas and Oklahoma, and I'm sure many more states, use this number for the VIN on the title.
This causes confusion as owners may look at the flimisy red tag for the VIN and find it doesn't match the title. I came across one e-bay seller in Oklahoma that claimed the title did not match the bike. In reality, he was looking at the tag number instead of the frame number. Upon closer inspection, the frame number matched the title perfectly.
"A Thiefs Dream" sounds like the basis for a great essay!