It probably means that someone didn't pay up. And that was the reason why the employee falsified the bank statements to begin with. It doesn't mean the money is missing.
It doesn't mean that the money wasn't in the account on June 2015. It simply means that RELATIVE to last year, cash will be $16M less. And that's because A/R is going up RELATIVE to last year.
And that's because they have to disclose material changes RELATIVE to last year if they are late reporting the numbers.