Interesting note on storing cash in "bunkers", according to Wikipedia [0] (referenced to a book "The Accountant's Story"), Escobar and crew used to have to write off 10% of their money stored in warehouses because rats would actually come and nibble away at the bills.

Unfathomable to me having so much money that you need literal warehouses for it, but even more amazing is that there was no alternative besides a 10% year over year loss on your stored capital. When you're talking about a cartel that was bringing in roughly $22Bn a year (also Wikipedia) that amounts to roughly $2.2Bn a year sunk to rats.

So, in retrospect, if you can do it legally, the Fed's bills seem like a great deal compared to stockpiling cash. And I'm sure you're paying far less to secure those, although I'm not exactly sure how these treasuries work and if you could just purchase one worth $22Bn and put it in a safe somewhere. Seems like it'd be just about impossible to steal something like that and pass it off as your own.

[0] - https://en.wikipedia.org/wiki/Pablo_Escobar#cite_note-accoun...