Today I sought out, and indeed did find, Jolly G-Man's "Knowhadamean
Fern?" Unfortunately, the box was full of water, the baggies were
full of water, the log book is a sodden mess, and there was even a
worm in the box. The stamp is the only thing that survived.
I've taken the box away to try to dry it out.

Jay - When I put the box back, it will have a new log book; the first
one is full anyway. Do you want me to put back the first book, too,
or send it to you? You can reply off-group.

Here is the info on the box for whoever notates these things on the
Clues list:

Virginia
MVT Series - Mt. Vernon - Fairfax Co.
Knowhadamean Fern?
Mount Vernon Trail Series #3
Dyke Marsh Wildlife Habitat
Belle Haven Park and Marina

I'll let the group know when I've put the repaired box back.

Mary