Multiple Skin ID's, and unavailable skinsNot An Issue

I was configuring the plugin using the document referred to in this forum:
https://umod.org/documentation/games/rust/definitions#skins

I noticed that some of the Skin Display names are listed multiple times, once with a 5 digit ID and then again with a 9-10 digit ID.
When i look up the shorter ID on steam it says the item does not exist.

I am sure this is all perfectly correct, I just lack sufficient understanding.

When I import the skin ID's into a json file for use in the skins plugin, some skins also show as unavailable in game too.

Is it that some skins are genuinely unavailable?
Should I be filtering out some of these skin ID's? or is it more likely an issue with the rust client failing to download them?

Thank you for your time.

Mat

Not all skins there are valid.

3sSXFWKnj0fbbZm.png misticos

Not all skins there are valid.

Mind shedding some light?

Rust's skin field on items is uint last time I've checked and does not allow negative IDs, also if you try opening workshop with some IDs specified it might not always find them.

thank you both for your time.

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