What is the proper use of the paper that comes with Smith & Wesson revolvers? The one that is shiny on one side?

Is it to be used after purchase? I assume new revolvers came wrapped in it with a coat of oil on them to prevent rust, and the paper kept the oil from staining everything else.

I see one can buy new sheets of it. So what is the ongoing proper use for it, if any?

Lastly, with guns that came with wooden presentation cases, were they shipped in the case with the paper wrapped around them to prevent them from staining the flocking?

Does anyone continue to use the paper to keep from staining the flocking in presentation cases to this day? I have three reflocked cases Joe CeBull did and want to keep them as pristine as possible. All my revolvers are nickle or stainless, and I do not keep them in the S&W cases, they are in Pelican cases.

Thank you for any information, much appreciated.