Personally, I think "pretty" things kept artificially scarce and heavily marketed to the point that there is a social obligation to purchase them for certain occasions are worthless. I have no idea why you are trying to pick a fight about this stupid shit.
Under capitalism, the economic system in which this "heist" took place, things are worth what you can sell them for. That's the capitalist definition of value. If you mark them up 1000% and people will still buy them then you can say they are worth 1000%.
Not really fraud when it comes to insurance which is what my wording most implied. Good point.
I was thinking that it might be considered fraud when amounts were reported to Brink but I admit I know nothing about transportation/security type things. If Brink is just insuring it and the security is just to protect what is insured maybe it doesn't matter. I know I'd be pissed if I was told I'd been transporting a much higher value target than I was paid to transport, and on a regular basis. $150 million is way more dangerous to transport than $8 mil.