I had to provide vehicle registration. Since I had it on me I didn't try and BS my way around it but I reckon they're sticklers for this seeing that you can read a VIN right through the windshield...bill of sale if you mean title with the back signed then that would probably work...piece of paper with signature..a little less so for obvious reasons.

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1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)