Ha ha...it didn't occur to me, or any of the gallery people, either. There was no sign of a sale on any of their paperwork. So that was the conclusion. I posted on DP and FB and Flickr in an effort to get word around.
In a word: I was upset. And not clever enough to come up with an effective way to deal with it. In the event of a theft of that sort I don't have a clue what the best course of action is.