Again, since you are in California, do not accept anything other than an actual
"pink". No bill of sale, no handwritten anything, etc. Trust me, I've been there. You will either have to pay way too much money to get it brought current, or more likely, won't be able to get it titled at all. If you are still tempted, go to the DMV or the Auto Club and ask before you hand over any cash. P.S. In Ca., for boats you will also be liable for past personal property taxes payable to the county it's in.