Massive theft at Dallas card show, Nearly 2 Million Dollars worth of cards stolen

[Yoda]

In insurance lingo, this was a theft rather than a robbery, where violence or threats violence are directed at the policyholder. The policy would be some type of all risk personal property floater, perhaps manuscript to fit Ash's needs, subject to normal policy exclusions, eg. war nuclear etc. It should respond and pay his claim less any deductible. But, as Steve pointed out, if the policy is endorsed by stating security must be on the floor during setup and breakdown, then there might be a problem.
You can bet that the insurer has top knot loss adjusters working with the police or alone to solve this tragedy.