Join Date: Jan 2005
Location: Egham, Surrey, UK
Programs: Mucci Champion des Champions, BAG4L, *A Gold, HH DIA, Hyatt Explorist, Hertz Gold, Avis President
Posts: 3,417
This has happened to me on a couple of occassions. I spoke to the US Embassy in London and they said it was in my interest to send a copy of my passport front page and the slip with a covering letter as it could cause issues next time I tried to enter the US.
I doubt that I would have had any issues but have always decided to err on the side of caution - just in case!