The feeb suspected the safe deposit company of malfeasance.
The judge that signed the warrant specifically exempted the contents of the safe deposit boxes from seizure, only the company property materially connected to the suspected malfeasance.
So the feeb being the fine upstanding agency that it is...
..promptly seized the safe deposits and “catalogued” them, didn’t bother trying to contact most of the owners, accused those who contacted them about their property of being criminals.
Solicited bribes from some by way of “we will let you keep some of your money/property if you sign this and forfeit the rest to us in our benevolence”.
You know, the Abel Reyna method of dealing with seized property.
You know what they used to do with pirates and horse thieves...