The Negreet area is generally located in far southwest 6N - 11W and 12W reaching southward into 5N - 11 & 12W. There are a number of leases being filed by multiple companies in those same ranges in 7N. There are only some rights-of-way agreements filed recently in 6N. If the shale related leasing ever gets as far south as 6N and 5N, it will take a while. If it ever goes that far south.
I post the Clerk of Court filings for Sabine Parish on the Sabine Group Page whenever I run across them. It's the best way to find reliable evidence of leasing.