How would this even do anyone any good? Assuming you posted the numbers, someone went and used them (illegally mind you, risking huge fines) as soon as you go to register yours, they say the numbers are in use, you show them previous registration documentation to prove yours is the "real" one and bingo. It wouldn't take much to verify the integrity of yours - bit of a difference between someone using a set of supercheap punches to punch a replica vin into their chassis and your original one.
I can't seriously believe this sort of thing happens - why would you have one with no numbers anyway?
It would classify the same as rebirthing and would be very much frowned upon by mr plod!

