pathfinder

Last month when i came back canada from US i forgot giving I-94 back to guard and the guard didnot ask me either. according to the back of I-94 card, if you don't give I-94 back when you come out US, you will have trouble in next time you want to re-enter.
who has the same experience as mine,and how to solve it?

happycanada

用双挂号信寄给他们，并附上信说明一下。