I found a gray plastic battery hatch cover and put it on the lost and found table.
I took a photo, but the file size is too big for me to upload.
If you wonder if it might be yours, message me your email address and I can send you the photo.
The Other Paul
Found a way to reduce file size.
I believe that is the battery hatch to Kirk's Carbon Cub.
Did you happen locate a 2200 mah battery near it?
Frank