Windows 10: COA labels

Hi. We are a workstation builder and always when we install an image of win10pro on a machine, we put a COA label on the housing. Now currently we purchased 10 win10pro licenses which are missing the red/rosa back-label, so we cannot get the label from the envelope which contains the CD without destroying it. Consequently, we cannot put the label on the housing. We have reported this to the point of purchase, but they replayed that there is nothing wrong withe the product key, so they cannot take the product back. From our view, we cannot use these. What to do?

:)

 

OEM COA labels

Someone on eBay is offering COA labels for Windows 7. They are unbranded OEM labels but have never been used and are still on their protective backing and can be stuck to a computer if required. If we were to assume they've never been used, am I in breach
of OEM licence to activate it on any computer model/brand? If so, is it ok to have more than 1 COA label on a computer?

 

OEM COA labels

Genuine Windows product keys are always sold with installation media.

 

COA label recovery

If 7 came preinstalled and the product key is erased/worn on the COA sticker:

You could use a torch and magnifying glass to attempt to read it.

Or take a photo of it and enlarge it on the screen.