JAL Mileage Bank - Totally off chance, expired JMB 'vouchers'?

I know this is extremely unlikely, but has anyone had any luck with having had expired JMB vouchers (exchanged from miles) re-validated, and if so, how did you go about it?

My husband never got round to using the vouchers and they have ended up expiring, so we are wondering if there is any way of resurrecting them.