Hello ExChair,
If you have bought Online, Then Check on www.adobe.com, under my order's 
If you've bought of the ReSeller, There would be Jewel case inside the BOX
Now Just in case if you have bought a EDU version, you would need to follow the steps written on the BOX on the small white card you will have inside the box to get the serial number after you are prove your eligibility, or just give us call, in a worst case scenario 
Cheers!
LP