Unused address which is set when adding to escrow - _escrow[collection][id] = msg.sender
Can be just marked as true/false because in case of l2->l1 bridging, l2 owner can set any address on l1 as the new owner.
Set _escrow[collection][id] mapping value to a simple true/false
Please, do not suppose impacts, think about the real impact of the bug and check the CodeHawks documentation to confirm: https://docs.codehawks.com/hawks-auditors/how-to-determine-a-finding-validity A PoC always helps to understand the real impact possible.
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