Let's back up a minute, operationally speaking.
When you remit to the state for escheatment, is this done via one large cashier's check or via wire transfer? Either way you have a bunch of debits to accounts, offsets to check settlement accounts, etc. to fund the one large transaction. Your notification to the state will include whatever itemization of what is being remitted. You are not going to create a special cashier's check for this one safe deposit box.
To Randy's point, the cash should be held in a bag in safekeeping in case the owner comes to claim it prior to escheatment. To Happy's point, the teller cash in is just one of many debit entries that offset the large cashier's check or wire transfer you send to the state. This does not reset the escheatment clock on this asset.
To BSA requirements, this is not a purchase made by your customer. It is a bank initiated transaction completed to comply with your operational requirements under state law. It does not trigger a CTR or recordkeeping requirement. Simply note the circumstances behind the false positive on your cash log or automated system.
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