After thinking I'd find it any day and not finding it for half a year or so, I called Capresso last week and asked if I could order a replacement. It wasn't on their spare parts list, so they said "well, we don't know how much it should cost, so it's free. What's your address?" I had to argue with them to get them to charge me shipping - and $4.50 is probably too little to ship it from New Jersey.
So... there you have it. Fantastic coffee maker, and sold by a company that will - without prompting - offer to ship you a replacement part that's only there to look good, which you lost due to your own incompetence and not through any fault of theirs, for no money whatsoever. Thank you, Capresso.