I had the same thing happen on a flight from Amsterdam in August, was asked to consolidate bags as it was a full flight so my SLR ended up in my checked luggage, when we arrived home the camera had vanished, the only time the bag would have been opened was during security checks at AMS.

My insurance didn't cover because they claim my bags were left "unattended" and British Airways are pointing the finger at security. Not one seems to want to take responsibility. Next course of action for me is to report as a crime.