Shipping to Authenticator re: Can I use USPS Priority Mail Box with FedEx Label?

[jachic79]

I recently posted an item to sell that looks like it will need to be sent to the eBay authenticator when it is sold, which uses FedEx.  I use USPS Priority Mail boxes when I ship my items, and I wanted to see if I can put the FedEx label on the USPS Priority Mail box when I ship the item to the authenticator.  I wasn't able to find a good answer when I searched online.

Thank you for your help!

[rock.star]

That would be a No!  It is a misuse of Post office resources. 

[jachic79]

Thank you!  I appreciate the help!