Back in the day, you could trust a 2x4 to be straight
Had a whole stack of studs from the lumberyard bow like crazy after sitting in my garage for a week. Anyone got a good local supplier in the Tacoma area that still stocks decent framing lumber?
Check for any moisture or damp spots down there first. I mean, my aunt's basement ruined a whole box of her books because of a slow pipe leak. Maybe get some of those silica gel packs and toss them in with the stuff you're storing. It's not perfect but it helps a lot.