Same thing happened to me in Sept. The guard was 'being a nice guy' by 'secretly' telling me to 'throw away the guts' and to 'not be obvious'..
Didn't even realize I had it on me until I went for the before-a-long-ass-flight-smoke. Normally this wouldn't bother me, but it was a present from the girlfriend at the time so it had some value to it. I now own a zippo shell. (Post note: co-worker felt sorry for me and gave me one of their spares so I'm all set again haha)