Is it possible to lock the memory tray on an iMac 27" (late 2012)?
I just saw this yesterday on cultofmac.com which basically answered all my problems "Maclocks.com comes up with the only solution to fully protect your new iMac" http://www.cultofmac.com/235129/maclocks-lock-for-imac-prevents-your-ram-from-being-stolen-for-just-50/

Here is the link to the product page itself http://www.maclocks.com/imac-locks/imac-security-cable-lock.html 

Thanks for bringing awareness to this issue and thanks to maclocks for solving it!