Individuals and companies with billions of dollars in cash can't really stick it in a mattress and ignore it.
True. Far better to bury it somewhere remote. See this "news article" from the future about how it plays out:
The desert dollar industry
January 1, 2021
These days, the desert is swimming in cash... literally.
Over the last six months, a booming business in illegal
cash storage has sprung up in Nevada, New Mexico, and
Arizona where analysts estimate that $30 billion worth of
$100 notes have been hidden. By day, smugglers drive deep
into the desert, SUVs loaded down with suitcases full of
Ben Franklins. Once they've found an ideal spot, they wait
till the sun goes down and frantically dig a hole, only to
drive away the next morning with nothing but the cache's
GPS coordinates and a drone or two to guard it. When asked
about the sorts of people staying at her motel these days,
Smith shrugs. "I don't ask who they are and they pay cash."
...
True. Far better to bury it somewhere remote. See this "news article" from the future about how it plays out:
http://jpkoning.blogspot.com/2015/12/the-desert-dollar-indus...