I've personally never had an issue storing ammo in it's packaging I've got decades old ammo but I do keep most of it in my safe with silica desiccant. I did put hundreds of rounds into those mtm plastic 100 count cases All the discolored over time It didn't hurt function. Never used those military ammo cans lots of people swear by them.
I have an lcp first Gen in .380 with a laser attachment. Trigger isn't great. But for what it's intended for it'll work.
I've mentioned previously the issues with it. They are having a lot of unintentional discharges, some not when having the trigger touched. I'm sorry, that's a bad design and sig needs to remedy this ASAP.
I've gone as far as to vacuum seal ammo boxes with dessicants. Quick question...does the guy mention how surplus ammo from the 50s still comes out of it's original packaging looking new? They do pack them in cardboard, though possibly not the same cardboard as today. I will admit that original packaging + moisture is no bueno. Moisture + ammo is generally gonna be a bad time no matter the circumstance. I really don't think that the method matters a whole lot so long as it's kept dry. Extreme temp swings can bring condensation. Dessicants will mitigate pretty well. I'm currently storing a bunch in original boxes, inside plastic Plano cans. I get free dessicant packs from products shipped in cardboard barrels at my work. (they aren't expensive)
There's vastly superior proven service pistols out there Glock needs to upgrade to more modern tastes but they are still excellent. I have a lot of experience with the Smith and Wesson m&p series I've had 7 versions fullsize compact and the micro compact shield plus's now. I've shot CZ 75 pistols for about 30 year's and the p10 series a lot in the last couple years. The Walther PDP series is excellent. My current favorite is the arex delta series It's in use by militaries overseas but it's low price accuracy and reliability impressed me. Sig should never have released a unproven design that led to the mess they have now. They've lost all confidence in the 320 platform Blaming customer's many of those injured were military,law enforcement of otherwise trained individuals For their malfunctioning pistols.