@willywonka …respectfully, does each single cable have a unique serial number? The reason I ask…is a serial number may not buy you that much either… only if you can use it to validate with mfg.
I think the best, but not perfect answer is to request and maintain original receipts for purposes of authenticity.
One thing I still find really suspicious is when cables like Valhallas were being sold without their original wood cases …who would spend tens of thousands on cables and throw out the custom boxes (and doc)…??!!