Portland boat owners

buying a used boat in Portland and am waiting on the title and registrations from the owner.

i'm being told that they have a paper copy of the registration for the trailer, but that there is no paper copy for the boat. that the registration is actually a sticker on the hull. is this true? my lender needs a copies of both registrations and the released title to fund the loan. just looking for some verification here. he even said he went down to the marine board or whatever thinking maybe he lost it and they confirmed there is no paper registration for the boat itself, only the trailer. please advise- thanks