I guess you got a real lemmon of an agent.

Last time through ORD, we presented our onward LAX BP. I pulled out my stubs from LHR (I always keep them) and told her we just arrived from LHR. She said, "I know that, wanna know how I know that. I just look here and see that it was issued by LHRCC (or whatever the code is)." So they can tell. She was very pleasant, though we did not get chits. Must admit I didn't press her and was in a delicate state anyway (dodgy takeaway a few days before )

Sometimes I do get the chits on arrival (they seem nice at JFK and do this for me), but most times at IAD/ORD, I don't.

I'll see what happens next saturday.