In article , Rupert
Goodwins wrote:

If I wanted to actually *plan* to steal
it, then it would be very easy to make a small fake to leave in its
place; I doubted that anyone would notice for a very long time.

Certainly the most recent thief didn't notice. If you see a 'Moon
rock' advertised on e-bay that looks exactly like a broken shard of a
coffee mug, you know where it came from.

--
David M. Palmer (formerly @clark.net, @ematic.com)