If you put the guns in the attic, do two things:
1. Put them in a moisture sealed container with silica gel desiccant.
2. Cover them with insulation or such to conceal them.
In 1992, I stored my Firearms in my attic during the summer (West central Georgia). VERY HUMID!!!!
Most fared well, but one, the bore rusted unnoticed till I fired it the following fall. Instant pitting due to bore “sweating” due to temperature swings.
When I was a police officer, I once worked a burglary that involved the theft of a gun collection. It had been stored in an attic, but they were just stacked near the folding, ceiling mounted stairs. Burglar(s) evidently knew what they were looking for as resident found the stairs left down.
Epilogue; investigatiors determined later it was the boyfriend of his “ex”, who was getting the ugly end of the divorce. Ex got her divorce, boyfriend got 2-10yrs for a residential burglary. Complainant got the guns back, mostly. Ex and bf got greedy and sold several of the guns. Led to getting caught. Not all guns were recovered, however.