azrael-: Especially if we're really talking about tailor-made recovery discs, because they're usually tied to a quite specific hardware configuration. Also, "real" recovery discs have the nasty habit of wiping the PC's HDD clean in the "recovery" process.
wodmarach: These seem to have been mass produced (factory pressing not burnt at the time of sale) which kinda makes me think they weren't tailored for the actual machine they were sold with...
You can still have tailor-made discs and mass-produce them, if the systems they're intended for are produced in a sufficient quantity. Recovery discs for e.g. HP systems would most probably not work with e.g. Dell systems, and you might even require different recovery discs for different HP systems, due to different pre-installed software or differing hardware.
If the recovery disc is actually just a copy of a Windows install disc it's a different matter altogether, but still, as long as you don't have a valid and genuine product key such a disc is mostly useless.