Found it!
All of my wet gear in my tiny vestibule.
Miles Today: 16.9
Mile Marker: 564.5
I spent the first part of the morning thinking I had somehow missed the quarter mile mark. I hadn't seen it, Tailgate hadn't seen it, Ho Chi Minh hadn't seen it, and Circus hadn't seen it either. Tailgate saw someone post it on the Appalachian Trail Facebook group yesterday, so we were confident it existed, just not if we had passed it. Finally we found it and my suspicions were confirmed. The sign says 547, but it is now at what is mile 550.8 due to trail rerouting.
After that mystery was solved, the day was pretty uneventful. I felt like I was moving kind of slowly, but I got my miles in. Unfortunately I didn't get them in before the thunderstorms rolled in. The skies had been threatening rain all day, but they didn't deliver until the last hour of my hike today. I kept hiking until the rain died down enough for me to throw up my tent quickly without the inside getting soaked. The downside to having such a small tent is I don't really have any extra room to put wet cloths to dry, or much space in my vestibule to cook. Thankfully I packed out a family sized box of Cheezits I can snack on while I workout how I'm going to make dinner.