Forgot to surrender my visa on departing the USA, will i have trouble returning in future?

Question

On returning from a 2 wk holiday to Canada which involved 2 hours in the USA after entering and leaving on foot across Niagara Falls I noticed (on the back) of the USA visa I was supposed to surrender it on leaving the country. So I suppose as i forgot the US immigration authorities must assume I'm still living their illegally. If i ever wanted to return would they let me back in?

Answer 1

i did it in 2003, but who cares

Answer 2

The entry stamp on your passport back into your country or another country that you went to after the US will prove you left. It happens a lot.**