Let's say, prior to a divorce, one spouse withdraws a large chunk of cash, goes to Vegas, and at the conclusion of the trip, declares that he lost all the cash gambling. In reality, he socks the cash away somewhere he can retrieve it discreetly after the divorce.

How do divorce lawyers deal with this scenario?  It's pretty obvious, so I'm sure there's a known or standard way to handle it. How would they distinguish it from a guy who genuinely loses the cash, saying, "I would rather gamble away all that money than let her have a dime of it!"

The bitcoin variant would be to quietly buy some btc for cash in Vegas, while playing a little to provide some cover for the purported losses. I'm sure this is all kinds of illegal and would result in serious penalties if caught, but then, how would the lawyers go about investigating this and proving it to the court's satisfaction?