On the perimeter wall of Arkham City is the TYGER confiscated goods vault. This high security facility houses all the items confiscated from criminals upon their admittance to the prison. A special vault is used to protect the equipment and ill-gotten gains of the various super-criminals and it is guarded 24/7 by a squad of TYGER guards.
Upon her arrest, Hugo Strange placed all Catwoman's belongings there, and she was vowed to get them back and leave Arkham City for good.

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Gotham City Stories
FanfictionRipped straight from the files of the Arkhamverse including Batman Arkham Asylum, Batman Arkham City and Batman Arkham Knight but prominently the Gotham City Stories of Batman Arkham Knight. (Not a part of the #villainverse)