Oh man, is this a "California" kind of question? With all the oppression that I have heard about taking place down there, I'm wondering if it's "the law" now that even your ammo has to be locked up during transport. Of course, with the way the next elections are shaping up, all kinds of tyranny may be inacted on a FEDERAL level....sheesh. Anyway, up here in fungus corners, I use plastic 100 round ammo boxes inside a water tight box because of all our rain. Even then, everything gets wet and I have to take care to avoid problems. The brass has to be dried off on an old cookie pan on top of the wood burner. Unfired ammo gets dried off with an old towel before being re-boxed. Thank-god for Glock finish and kydex! Otherwise, in WA state there's no hu-hu about transporting ammo. Well, you can't drive around with a loaded rifle, but otherwise, no worries.
---Wyley