You do realise it's electronic? Which means when you submit it, it goes into their immigration system? Which means when they scan your passport upon entry, the system will show the TM6 details?
If the visa/extension has been obtained through fraudulent methods, it most definitely can be cancelled back to when it was issued, meaning the foreigner is automatically on overstay. Don't kid yourself that it's a "legit" visa - it most definitely isn't!