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Howdy!
Each maker uses a different process (and materials) for holster finishing. I would suggest that you contact the person who has made/is making the holster(s) in question, and ask them for specifics. Each of our holsters is shipped with a "Care & Feeding" sheet that covers this information for our products. (If you buy one of our holsters used, we'll be glad to send you a sheet at no charge, or you can click on the "Care & Feeding" section of our website and print one out).
As far as a dummy gun goes, I would not use one to break in your holster. There are no dummy guns made that are exactly like your particular firearm ( even guns made by the same manufacturer will have dimensional differences between them as the tooling wears over time and minor design modifications are made).
We intentionally fit our holsters pretty snug to allow the end user to break them in to perfectly fit their individual firearm. What I'm getting at is that you'll end up breaking in your holster to fit your dummy gun, rather than the gun you intend to carry in it.
With regard to storage, leather needs to "breath" in order not to mildue and/or grow mold. I would store holsters at room temp, with minimal humidity (maybe 50% or preferably less) without anything inside them. That should give you the best possible results.
Good luck!
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