If he wrapped in in damp towels overnite your 89 year old granny can likely yank it off the board for him.

How did it go Dave?

Be more careful with the mink, it just went up in value after the FHA sale....

I just got around to put it soak wet paper towels wrapped up. I add more water, we'll see in morning

Damp is good enough. No need to over-wet them. Keep them someplace kind of warm so the moisture can work in.

I have done it with mink several times over the years and just used a damp towel. Worked well. As they are fur-in, that helps greatly.
I did a very nice marten once, as well. It was a year that prices were supposed to be very good, and I had just enough time to get the last few marten off the boards and get them in the mail to the FHA rep up in Fairbanks. When I got to the last marten a saw no belly wedge, fur-out, I knew I had two choices. Soak the marten and skip shipping it or splitting the stretcher. I chose the latter.
It was the one time I regretted using my personal method of boarding marten fur-out right off the bat. I waxed all my marten boards, and as such could simply put them up fur-out, use a proper wedge, pin and go to the next one. No checking on them several hours after initially putting them up fur-in, then turning them to fur-out, (I used to do them like that).
I made the right choice, as that marten brought around $120 that sale. The next sale several months later, was off about 30%, if memory serves.