(written from a Production point of view)
The Tilavan art theft was a criminal case mentioned in the script of the Star Trek: Deep Space Nine episode "Extreme Measures", but cut from the episode as broadcast. It involved the theft of holo-sculptures by an (as of 2375) unknown party. In that year, Odo claimed that he had been working on the case for nine years, perhaps implying that it took place in 2366. Quark claimed that he thought he knew who was responsible. He also suggested that the case had been on both his and Odo's mind all that time.