Oak Apple Galls at Lake of Bays

Someone in our tracking crew had found a small, pale brown, hollow papery orb with spots on the surface with a couple of holes in it. I recognized it as an Oak Apple Gall, which my partner and I had found last year at Backus Woods. It wasn’t a green one, but it must be the same thing, right?
Last year, I may have looked up a bit on the Oak Apple Gall, but I no longer remember much. It’s like meeting someone again, but not remembering much of the details of your previous conversation. I had to ask some questions again, and here is some of what I have learned.