April's update, I did in fact send e-mails to the last known possessor of all of my geocoins (except Free State Generic #1, pictured above, which was moving along at a healthy clip). Not only did I not hear back from anyone (either via e-mail or by having them loosen their grip on the coins), Free State Generic #1, after being placed in Alabama and picked up, also went off the grid.
Until last Sunday. At that point, someone retroactively recorded that they had dropped it off on July 22...0.85 miles from its previous location. Ah, well. At least it's still "alive".
This just makes me want to dig out the ones I have upstairs and launch some new coins. Now that the weather has cooled down, I know a nice place where there's a cache near a bike trail. As soon as the kids give us a moment of rest, maybe I'll try to find the time to get them set up and dropped off.