I think that 17 digit VIN thing might only be for manufactured vehicles.
South Carolina required something like 11 (I know that because my made-up trailer VIN was my last name and birth date)
And this is from the MASS RMV site:
"Massachusetts-assigned Vehicle Identification Numbers contain the prefix “MA” followed by five digits." That's what Pearl's VIN looks like.
http://freevinsearch.net/state...chusetts-vin-search/
So I think there could be a lot of leeway out there in "assigned" VIN numbers and the local RMVs take it all in stride (more or less).