One other way is to sell it to a trusted friend in another state where he can register it, then sell it back to you...with documentation, then you'll be able to title it in your name. In Ma they require titles, in NH they don't....
On the other hand, I've been to the RMV and been told no to certain questions...walked out and driven to the next nearest RMV location and been told yes.
A bill of sale might be all you need if you get called to the right window...