Happened to me, too, in Boston. Fallkniven F1 that lived in my EDC daypack that became my carryon. I had a good outcome, however.

The X-ray tech pointed to the image and asked, "What's this?" I said, "Oh gosh darn it to heck" (something like that) immediately when I realized what it was. The tech walked me out of the inspection area to a kiosk which had shipping envelopes. The knife went into the envelope with credit card info.

I thought the odds were no better than even that I would ever see it again. But it arrived home about three weeks later. What surprised me was that it came from North Carolina. Apparently there is a company there that gathers and returns such stuff.

With all the (often deserved) bad press that the TSA gets it is nice to be able to report extra effort good treatment.