Question on cover letters

I’ve always considered myself an expert on writing cover letters.  Here’s what I’ve always said:

“This is all you need: ‘Good morning.  Enclosed (or attached) is my x000 word story <name> for consideration in your <title> anthology.  I hope you like it.’  That’s it, except that if you have professional credits, mention them.”

Fine advice, and I still stand by it.  Only, how exactly do you mention those professional credits without sounding like an idiot?  Appending, “I have sold a story to <name> anthology,” sounds, well, stupid.  I don’t like it.

Does anyone have any suggestions that flow better?

Shadow Unit: Elevator Speculations

For those of you who saw the latest episode, I have a weird one. In that bit where Chaz has that split-second of, “Uh, oh…” on the way down to the office, and then nothing happens (with that great line about salmon souffle–God, that was lovely), it seems to me he makes this really quick glance at the blank wall of the elevator. Was that a bloop, or my imagination, or a hint? In other words, is there something, uh, special about that elevator that we might or might not find out about later? Did anyone else even see it?