Could be an insurance scam too though. A local pet store back in Arizona got busted after the third time high dollar birds were stolen from him for insurance fraud. He'd have someone "steal" the birds and sell them to a pre-arranged buyer and then report them "stolen" and collect insurance money.
$4k in coral? That amount makes me suspicious of the same thing possibly be done. Saying the dude only took a few corals, what would fit in one 5 gallon bucket and it was worth $4,000? I may be 100% wrong, but I smell something.
Fcamdog