Abstract: A lock type sealed security device or unit for clamping bills accumulated in vending machine validating or other paper currency accumulating devices. The device is locked onto the accumulating device in a position which allows the currency to be accumulated therein. When the currency is desired to be removed, the device is moved into a clamping position and operated to securely clamp the sheaf of paper currency therein. The security device can be unlocked from the validating device only when the currency is clamped and an unclamped sealed security device can be mounted in its place on the validating device. The security device with the currency clamped therein then is removed to a collection area, where the device is unsealed and the currency is unclamped and removed.