Because they didn't have one. They used a vague search warrant to seize ALL of the safety deposit boxes on this company's offices on the basis that an undefined few were being used to further criminal enterprise. The government after the seizure then simply declared, out of thin air, that all seized property was part of a criminal enterprise without any specific reasons, charges, or other formal paperwork.
This is not that uncommon for law enforcement agencies to do. They seize someone's property on flimsy grounds then force the person(s) involved into a lengthy court fight where the law enforcement agency has the financial backing of government to run the plaintiff out of money to fight them. Often, the agency involved will try to make a deal if it looks like they'll lose the case to give back a portion of the loot.
This is all part of abuse of RICO laws by law enforcement agencies who have discovered these are a cash cow for them when applied loosely.