Yeah, it's very weird that state agencies want to make the word "disease" off limits when it comes to turkeys, but with deer it's a normal talking point. A very similar situation happened here in my area of South MS during the mid 2010's. We went from having a decent amount of turkeys (gobbler, hens, and jakes) to almost nothing in a few years. Yes, dead turkeys were found and turned in here. The drop off was very noticeable to anyone who spent any time in the woods. I was told by someone with the state that it was definitely disease. That was pretty much the end of it and hasn't been brought up since. Around 10 years later and the rebound is much slower than any of us hoped it would be. I feel your pain for sure!