I'll tell ya what not to do. For years I stored boxes in the bottom of a storage cabinet out in my garage. Lots of cardboard blue S&W boxes ranging from the 1950s up to about the 1980s.
Quite a few years ago we had a massive rain storm. The drainage ditches got overwhelmed and two feet of water backed up into my garage.
Did I mention that the boxes were in the bottom of that cabinet?
I now keep them in the closet of my spare room.