Tag! You're it.
If the holster you get says Cabela's right on the back then you have the same line as I do, overnight won't harm it. If it doesn't say Cabelas I can't be sure so proceed with caution as it may not respond so well.
I think the purple stain is the trick here. It only seems to appear with modern tanning processes. It also appears very fast. Based on that I'd say if you got no purple coloration within the first 15~20 minutes you're probably not dealing with a chrome tanned item.
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Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”