How To Sell "Hot" Art/paintings?

Majoor art theft in Switzerland:Breitbart News Network
My question: how do you sell such well-known works? How do you find unsrupulous buyers? and, once you buy a painting (that you know has been stolen0, how do you show it off to your firnds?
Assuming all of you friends are crooks, no problem. But surely someone will report this to the local police?

I would guess the purchase was already made. That someone hired the theifs to go and take the works the collector wanted.

Art theft for private collectors is an urban legend.

Usually they try to ransom it back to the rightful owners.

A few examples :