When I got home, I posted DNF (did not find) logs for both of these. In the past, I've mostly avoiding these -- a lot of times, I feel like I didn't give sufficient effort to merit the comment. But if a number of people post DNF logs, it tells the owner that maybe the cache has gone missing.
I didn't expect anybody to assume it was missing on my say-so. My 20-something number of caches found marks me as clearly below-average in experience. Still, the guy in Odenton went out and double-checked that his cache was still there (it was). In Crofton, a few people have since found that one. Still, it's not always my lack of geocache-spotting savvy. In Bristol, I looked for one that I'm pretty sure was attached to fishing line in the harbor. I found fishing line, but nothing attached. Sure enough, the next day, it was disabled.
Last weekend saw better luck. Christina and I did a cache that involved a walking tour of Solomons to find clues for the final coordinates. Later in the day, I convinced her to cross the bridge into St. Mary's County so I could add to my Maryland counties cached. That produced this new map (notice that Calvert county has now moved into the "2-9 caches" category):