If an employee is made redundant, whether compulsory or voluntary, that is a premature release from the contract and therefore I would not expect any reserve liability. However, being the military and all that and that the MoD is exempt whole swathes of employement legislation stand by to standby.
I'm with the OP and SD, just return anything obvious back to sender. It's a known problem that manning haven't a clue where people are these days.
F*** 'em!