with the options presented:
sue - won't get anywhere because he'd rather burn the money and declare bankruptcy than give it back
call the authorities - he's behind bars... big whoop! money's lost, documents lost... I gain nothing
call IRS - no IRS in canada
call lawyer - done that and pending settlement... so far, he's willing to give back $18000 and leave the family alone. (slight gain, but damage is done)
beat him to death - personal gratification, does nothing to benefit the company though.
btw, we do garment manufacturing... clientel - tommy hilfiger, nautica, roots, etc.