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Deer do not need to be hung before butchering like a cow does. 21 days for beef, 5 to 7 days for elk, and no days for deer.
I understand your issue. I know a few people in Walla Walla and will ask around. If I find anyting I will let you know. There is a meat cutting place in Dayton that might let you do it. Its on the main drive and not sure what it is called.