Regardless if the dealer can or can not repossess the box if it is not paid off it is stolen from Snap-on or Snap-on credit or whatever bank and was never the property of whoever sold it. I agree the chances of it getting found are small but that's not really the point.
The real question in this situation is if a person is good with buying stolen property.
In the situation that we are talking about, if the original purchaser sells the box to someone else without paying off the balance due, it still would not be considered 'stolen'. What it would be is a CIVIL problem (versus a CRIMINAL problem) between Snap On and the original purchaser. The police are not going to get involved
And if the box was outright stolen (like someone broke in and took the box from someone) the Police would have to show that the new buyer was aware the box was stolen. (Would a 'reasonable' person know) Serial number ground off, price paid is pennies on the dollar, etc etc
