Storage and headstamp question

[CHW2021]

First, I am about to have to move my ammo into un climate controlled storage; too much ammo and too little room. The building is not excessively hot. What if any issues can I expect with ammo stored in hinged ammo cans or still in sealed spam cans?
Don't really want to do this but I need the room in the house.
Secondly, I noticed 1or 2 loose rounds headstamped Browning 30-06, I have not noticed this before and do not know anything about the ammo. Any ideas?

[raymeketa]

The Browning 30-06 is a plain vanilla cartridge manufactured and marketed by Browning.

[emmagee1917]

Heat and humidity are the killers . Seals can keep out the humidity IF they are indeed sealed. They don't help the heat .
Chris

[Sunray]

"...Heat and humidity are the killers..." Actually extreme variations of either. Consistent temperatures and humidity levels are fine. If your part of Louisiana gets wide variations of either, you may want to think of an alternate spot.