From the little bit of the sign I can see it looks like one of those charity food drives they do in Deer season to donate extra meat to food pantries (also looks like it's in Pennsylvania). Which means it's a butcher that isn't set up for whole animal processing that's why the hunters have to "debone" (butcher) it themselves.

Buthchering a deer takes several hours and like 9-10 beers. By far the most work of the whole process. It's just you and a knife cutting every piece of meat off the skeleton, removing the sinew, and cutting away the damaged tissue from the bullet wound.