In Government terms, that means
welding the actions closed, to never fire again. BATFE (or ATF, BATF) uses the term, "cannot be readily converted".
Not surprisingly, Google doesn't recognize the Government's own term "dewat", which means to deactivate the weapon, although I did manage to coax one reference out (and quoted below).
So, all the Wright Museum has to do, is spread their carbon footprint by welding the guns shut, put the guns on display and hope that someone doesn't steal them to retrofit with other guns' parts and bring them to a gun fight.
Had I been a Wright Museum's board member, I'd be afraid of losing much value in the museum's endowment. Their weapons' value in a trade with other museums (or closure) would lose a lot of value.
A Class III dealer tells of a similar situation.
Also try
www.wwiiguns.com.