[irishjuggler]

The painting is hideous. These folks should receive posthumous honors for doing the world a favor by keeping this monstrosity out of sight.

Seriously, though, considering their travel budget and cash net worth, they may have had a side 'business' of art theft. Perhaps they bit off more than they could chew with the de Kooning and found it too hot to fence.

[Tammy8]

That is what I think. I wonder if other art or maybe even artifacts have gone missing during their travels. They traveled a lot so that would be hard to track, but doubt they did another in the area where they lived. If they had it would seem the authorities would know by now.

It is indeed a mystery.