That's great you've managed to get the humidity levels higher

If you're looking for some brands/substrates, there's a couple of nice ones available through Amazon UK: Exo Terra Forest Bark, Zoo Med Reptibark, Exo Terra Coco husk, or general branded 'Coco coir' bricks work well. We tend to use a mix of a of these, and mix in sphagnum moss (as it helps humidity as well as having anti-bacterial properties).
Though can understand if you don't want to use too much substrate until the mites have cleared up. I would suspect the vets will suggest keeping on paper towels/kitchen paper with sphagnum moss until the mites are gone. But good you'll be able to visit one soon for confirmation!
It's insane how many sellers are convinced they have the wrong subspecies! Not uncommon at all sadly.. though, you may be able to get a partial refund (if you felt like contacting them again, plus mention the suspected mites). In general, Northerns are sold at a higher price vs. Indonesians.
joi wrote:Are the dry scales cause for concern? Is she sick?
Unlikely sick - just from the humidity as you already know about now
joi wrote:I checked her and cant see the bump. Are you referring to the top left at base of her tail?
Yup that was what I was referring to! Glad it was just something funny in the photo.
And as starscream has already said, it's not a big issue with having a wild caught (after initial health checks they should be fine, and personality wise should still tame down to the same level as a captive bred).
All the best, feel free to ask any further questions should anything pop up!