This happened in an area the included my lease. No banded birds found. WDFW Biologist came out and collected some birds with us and confirmed Aspergillosis, a very common fungal infection that birds get from eating moldy grain. Not sure where the grain came from, but we haven't seen any new dead or sick birds in over a week. Hunting is fine and consuming the meat is fine, but you could get the infection while cleaning the birds. It is not fatal to humans with normal immune systems.
-Mathue