CS6 Product key on HDD that was wiped

Unfortunately, only Adobe customer service can assist you with your issue. These are user forums; you are not addressing Adobe here.

Click on the link below, and after that click on "Still need Help? Contact us."

Then on the next page, click Chat

There is also a phone option.

http://helpx.adobe.com/contact.html?step=PHXS_downloading-installing-setting-up_licensing- activation

Incidentally, I forgot to mention that the s/n numbers shown in an installed Adobe application are truncated by design by Adobe, so as not to encourage software piracy.  The numbers you see there have had four digits chopped off.