I worked as a cashier for a while at a retailer that sold returns as open-box specials, and… yeah. It’s definitely possible.
When processing a return, the system first asked if the item had been opened. If no, it was added back to standard inventory. If yes, I believe we were then prompted whether on if it was defective, at which point it became a “Return to Vendor”. If it wasn’t, then we were prompted to either mark it as “Complete” or add a note as to condition and missing packaging or accessories. It then automatically generated an open-box sticker and added it to the system.
If someone said “No” to the defect question either in error or because they just work there and don’t understand GPU internals, then typed in the comment about ROPs the customer gave them, this is EXACTLY what the system would do.