I am asking how to get a stamp, you told me you never get a stam

I am asking how to get a stamp, you told me you never got a stamp. That is exactly what I don't want. But thanks. Those inspectors seem used to NOT stamp your passport because a lot of people travel across the border every day. I am asking how to insist to get a stamp because I am not a frequent border passer and my attorney need to stamp to file my I485 with the question of last date of entry.