I think the Sligsby Firefly's have all been sold off. Most, if not all of the grob tutors are grounded because props fall off, and a significant portion of the air cadet gliders are also U/S presently.
Most of these aircraft are PFI'd out to contractors, who are greedy and incompetent.
A few years ago, the ATC and the contractors couldn't balance the books on their fleet of 98 gliders. Until someone physically counted them and found there were actually 109 gliders. No wonder the books didn't balance.
Any thing that's front wheels have left the ground for 0.5 seconds counts. So everything from Landies to mobile kitchens can be counted if its hit a speed bump fast enough or been on rough terrain. The latest debate among the air ranks is whether to count vehicles that have been jacked up more than a foot.