Caveat Vendor in a Banksy Sale in Gaza?

In March, while I was co-teaching  a course called International Humanitarian Law in Israel and Palestine with Professor Yaël Ronen, I visited Bethlehem with my students.  Among other things, we saw the image at left, attributed to Banksy, on a wall in Bethlehem.

So today’s New York Times story about Banksy’s other creations in Gaza caught my eye.  The heart of the story, for the purposes of this blog, is that Banksy apparently painted an image of a weeping Greek goddess an the iron door of a destroyed home in Gaza.  An enterprising Gazan artist bought the door for less than $200, saying he wanted to protect the goddess.  The owner of the door was unaware that the painting could be worth hundreds of thousands of dollars.

According to the Times, the local authorities, Hamas, have confiscated the door, and its ownership and value are to be determined by a court.  I’m not sure what law the courts in Gaza would apply to such a dispute.  Does anybody think the buyer of the door has a duty to disclose its possible worth to the vendor?