A firearms certificate doesn't require you to store the weapon on particular property. It governs the right to purchase and own a weapon and specifies where and for what purpose any wepaons that are purchased under said certificate can be USED.
A weapon can be used for target shooting or for use killing animals on specific lands. The certificate will specify either use or both but must specify at least 1.
The claim Anthony would be in violation of the law by taking his own weapon home is nonsense. He would be in violation of the law if he tried to use a weapon for a purpose not authorized according to the terms of the certificate or on property where he was not authorized to do so.
It has to do with use not storage of the weapon.