They aren't punched actually, they are embossed stickers.
I got them in 2006 Corolla. Police wala checked the plates from behind. As he was confused too if they were orignals.
Fortunately I had originals in the car he let me go.
For Jeeps BK series is actual ajrak wali for car for now only BW* series came with ajrak.
So everyone knows.
And it's pretty easy to tell copies and orignals apart.
I have seen 1 car with BU* series. Not sure if that was issued on request or how.
How ever I have heard paying rs. 6000 you can get a number plate issued (only for those whose plates aren't issued yet).