About 25 years ago i immigrated to the U.S stayed about 1 year then returned to Canada where i have been working for the same company since my return.Entering the states on a recent pleasure trip the border guard informed me that i must surrender the green card that i recieved 25 years ago and that until i do i will not be permitted reentry into the U.S,big hassle because i have no idea where that green card is. Anyone have an idea what im supposed to do next? I get the feeling that the border guard is just making the preverbial mountain out of a mole hill but he has the power to put a flag on my file for any future trips to the states.