I kinda figured it would mess with the ph balance if there were enough of it on the hide.

Borax is not good for tanning. You've really gotta keep an eye on the pH as borax raises it and you'll have to do some fiddling to keep the pH in the proper range.

Hundreds of pelts I've sent to Moyles salt dried as well as large hides buffalo and elk, salted then folded while drying for smaller shipping package.

Never a problem with any of them and consider it a safety net for spoilage if shipped with in a year, done this for almost 25 years now, not one has slipped.

Always give the head more salt even though I work them all down to taxidermy grade, it's just safer due to the small pockets on them, I also turn the ears for better tanning.

Never use Borax for the answers given PH is a large concern for proper tanning in the garment field not so much for just showing a pelt.

Moyles does not accept wet or green pelts, only flint dried, or salt cure out, will accept moist salt cure if there is no dripping, if your are doubtful about how to do for keeping or shipping just call the tannery, lots of taxidermist's save their cost on tanning and shipping by doing tan's them selves, they are not garment tanning shops though, there is a difference in the end result and process.