Discorocker has compared selected files from three different Dev Kits, and after doing some fancy work with hashes and hex editors, discovered that the files in each dev kit are marked with unique "signatures" (6 bytes long).
At this point, we have no idea what these markers in only a few of the files means. These could be actual signatures that are a function of the TPM. Or it could be something random done at installation. At this point we don't know much more than that, but I thought I'd update everyone! If I've missed any info, feel free to add on.