An update:
The packages have still not arrived. I opened a case with USPS, but that is going no where.
I have refunded all TWENTY buyers to the tune of $444.78 (it could've been worse). Most of the buyers were understanding, some weren't. As of writing this, only one buyer has resorted to giving me neutral feedback. That buyer gave me this gem (read bottom to top):
Anyway, lessen learned. No more blue post boxes.