I hunt several WMA near there, the birds did not gobble until late this year. I think the warmer weather has them further along than normal.
My brother was in Green Swamp this past weekend and they did not hear anything either.
Just keep after them. Set up in areas you have seen them and wait em out. The hens should be close to being on the nest, and the gobblers will be out searching for other hens.

John