Prerequisite
All of serial number that you want to confirm should be being activated. If not satisfied, there is no way other than seeing your purchased license serial number.
    
Procedure 

1) Follow below steps on each computer:

2. Make a matrix of computer, product name and activated list. You will be able to confirm which computer the license is being used on by using the matrix. Typically, you can confirm the serial number by using first six digit numeric characters.

NOTE: This procedure only partially verifies the serial number, but the first six digits and the product name will give you the verification you need.