I wouldn't bother, the person is basically giving out public codes. For example:
[From his latest tweet]
freexblmerch sean
GYVF8-PF7RY-28D7V-VGWV8-CFGRM the fifth halo reach #NobleCode !
Google it, and it comes up with: http://twitter.com/#!/razorbladerayne/status/4101867789352960
Poted...