One thing with the tot lots looking as if they've been hunted is a lot of cities are using screens to clean the tot lots now to save time. Around here one crew uses what we used to call a beach cart towed by an ATV. Another city has a rig that actually has a brush like a street sweeper to push the material up the screen when towed. Have to say, those rigs do a fine job of scouring Everything. I have a small one that I used to use under the playground equipment where the kids dig. That was the only places goodies were found after they started the towed rigs. So, in reality my friend you had a way better day than you thought!