temporary certificate issued to spouse or next of kin for belt and braces coverage
aside from the issue of not having keys to the cabinet, a non SGC holder having keys to the cabinet etc etc
for shotguns there are certain loopholes
Technically if his estate has been left to someone they will be the new legal owner,
despite potentially not being legally able to hold them without a valid SGC
Shotguns can however be transferred or loaned without the FAC equivalent variation (you can loan a shotgun for 72hrs without notification)
get it added to someones SGC (either with consent from the FLO and/or consent by the new owner) or collected by an RFD