Well, here we are in the 'same boat' as
@Irish11 .
My brother in law bought a 1985 12' Valco and trailer yesterday and wants to license it so he has the option to use it on Federal waters. We talked to a licensing agent and they said it needed to be appraised. I asked where one might get such an appraisal and her response was that she didn't know.

I searched and found a valuation from J.D. Power but I don't know if that's going to fly withe the DMV agent or not.

I also found a WA Declaration Of Value form so we will get the seller to sign that before trying again.
Sure is a PIA for a 1000$ boat, motor, and trailer that needs a friend.
FYI
Requirements for vessel registration vary from state to state. In Washington, you must have a Washington title, current registration certificate, and current registration decals to operate or
moor a vessel. Exceptions to registration and titling are:
- Vessels that are not propelled by a motor (canoes, kayaks, etc.) and sailboats under 16 feet in length without a motor.
- Vessels that are less than 16 feet in length and have a motor of 10 horsepower or less and are used on non-federal waters only. All motorboats of any size or horsepower that are used on waters under federal jurisdiction must be registered.
- Properly registered vessels owned by residents of another state or country that use Washington waters for 60 days or less.