How to reliably remove Find My Mac from an old machine? (Lion and later)

Hi,
My company buys old Macs and resells them. Our current process involves wiping the disk using Disk Utility and reinstalling the OS via NetInstall. Recently we've discovered that this process does not remove old Find My Mac controls from previous owners.
From some initial experimenting, my current hypothesis is that a machine's Find My Mac data is stored in the EFI partition, which is not wiped by Disk Utility. (I haven't even figured out how to wipe it with diskutil -- I've only managed to "re-virginize" the drive completely using gparted in Linux.)
Does anybody have any experience with this and the most streamlined way to deal with removing Find My Mac controls from a 10.7.2+ machine? I realize that this may be something Apple's not hugely willing to talk about publicly as the information could be used for nefarious purposes. In our case, it's completely legal resale.
Thanks!

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How to reliably remove Find My Mac from an old machine? (Lion and later)

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