I agree with post #13.
If you use a pad or egg-shell type foam, be aware of the oil/grease & check it often. The "I let it sit for a few years." line is a non-starter to me.
My father has all of my grand-dads hunting rifles & shotguns in a glass case. He never cleans or checks them & has no protective measures(Eezox, CLP, anti-rust, etc).
The firearms are secured by the cabinet lock but not much else either.
PS; Post #12 has some nice pics.