Could the sellers actually be using 'drop shipping', and have zero stock? The MCO, MFG Cert of Origin, would then be coming from 'somewhere' other than the vendors office.
I would ask if the postmark(USPS, after all...) aligns with the location of APC, and others.
They could all be depending upon a source/warehouse that they have no control over.
Too conicidental that 'everything' happens in Memphis, unless maybe things are coming from Memphis. Just a SWAG.
tom
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