Microsoft Office 2011 Product Key

Hi All! I need help with activating my copy of Office 2011 on my iMac. I lost the DVD sleeve containing the product key, but have the box and the DVD itself.

Is there any way to extract the product key from the current working copy I have installed on my MacBook? I know that on Windows, theres a way to find the Product Key in the registry....but the .plist is encrypted on the Mac version and I can't decypher it.

Any help would be greatly appreciated! I'd hate to have to drop $100+ on a new copy just for losing the dang paper sleeve...