FYI: Apple provides a method for checking for Activation Lock
Apple have provided a method of checking before purchase that an iOS device isn't Activation Locked.
http://www.idownloadblog.com/2014/10/01/activation-lock-status-check/
Basically you just go to iCloud.com/ActivationLock and enter the IMEI number and a catchpa.
iMac (27-inch, Late 2013), OS X Mavericks (10.9.5), 13" Macbook Pro 2010 10.6.8