Batch traceability
One lot number on the vial, the box, the CoA and the invoice.
ATUM-style lot tracking in the warehouse, QR on the label, public verify page. If those four strings do not match, the carton is not ours.
Sets are separate vials: three lots, three QRs, three files. A blended cake would be a different CN heading and a different CoA. We do not import those.