Unless I'm fundamentally misunderstanding the concept of due process, I would think that the warrant's explicit language around _not_ searching the contents of the deposit boxes would be a violation of the 4th Amendment's warrant requirements (and therefore due process):

"Nests of safety deposit boxes and keys, and documents and records referring or relating to them since 2019. This warrant does not authorize a criminal search or seizure of the contents of warrant does not authorize a criminal search or seizure of the contents of the safety deposit boxes. In seizing the nests of safety deposit boxes, agents shall follow their written inventory policies to protect their agencies and the contents of the boxes. Also in accordance with their written policies, agents shall inspect the contents of the boxes in an effort to identify their owners in order to notify them so that they can claim their property;"

They were allowed to "inspect" the contents, but literally only with the goal of returning the property (which they still haven't done).