Received my 10-release shipment today on the West Coast of North America. I paid for the extra wrapper, which was a cheap option, and it may have made a difference: no cracked cases at all this time. The wrappers they use are fairly minimal, so I wasn't expecting much of an improvement in protection, but I'll keep paying for it if it keeps getting me undamaged goods.
One minor difference: the spares from Acoustic Sounds are branded with the Super Jewel Box logo on the front half in the bottom lefthand corner, while the ones Rhino uses are unbranded. Not a huge deal, but something to be aware of.