I think being missed is more than that:

> The warrant authorizing the raid expressly forbade federal agents from engaging in a "criminal search or seizure of the contents of the safety [sic] deposit boxes."

and then

> Under typical FBI procedure, the boxes should have been taken into custody until they could be returned to their rightful owners. But those "supplemental instructions" drawn up by the special agent in charge of the operation told agents to be on the lookout for cash stored inside the safe-deposit boxes and to note "anything which suggests the cash may be criminal proceeds."

So no judge was involved in the decision to seize cash. It was an agent on the site who came up with supplemental instructions. There are a million reasons this should be illegal.