Hello Troy,
1st - I am just seeing your note now ? Wonder how so?
Competently agree. I do not answer the question. I will please try to better answer the question- if still incomplete. All precious [solid] metal jewelry [ without diamonds / gemstones / pearls] is stored in “just fit” zip lick [seal of some sort] plastic bags as air tight [air void] as possible. If a pedant is stored with it’s chain - think for example rose gold where the matching color of chain to pendant can be challenging] then a bubble plastic bag is used. The second a bit wider and taller - the ends of the chain go through the inner bag.This is all done to make life a little easier to get the piece out of the bags.
These bags are then placed inside a bubble wrapper paper covered opaque bag that is then placed in a metal drawer of a well made cabinet [the metal drawer itself fits exactly so is a barrier to the passage of air to inside it.]. he condition inside the drawer is presumed dark. The humidity of the room where the cabinet is: 52 { as of now using a hygrometer measurement tool} I do not know what the humidity is inside the drawers are but could find out if a need were inclined.
There is no sulfur dioxide etc.absorbent material used.
The two precious metals stored are gold and silver. 14 & 18K & .925.
The longest stored, are some .925 Silver jewelry from late 2019 that when last examined [ a guess 1/2 year ago] under 3X magnification showed “minimal” tarnish that is removable.
None of these jewelry pieces are removed from storage unless needed. In general the cabinet drawers are never opened except for a specific reason.
I hope this answer is better and of some help, Thank you,
Andrew