Bart...one can't unilaterally void a contract. What has Nevada done to judicially seek back the land for the state? What has Nevada attempted to negotiate with the Feds in regards a purchase of the US owned property? The short answer is nothing for they are well aware the Fed government owns the land and at this juncture, it appears the US isn't selling.
I don't think the Nevada land negotiations I am going to write about had anything to do directly with the BLM lands of Bundy, but Nevada did work out a deal with the Federal Government related to lands they thought they were deprived up as part of their statehood Enabling Act. IIRC, that settlement satisfied all claims Nevada had as to Federal lands within the state. This is all going from recall, based on a year of Nevada history taken while attending college in Reno.
In the 1950's Nevada entered into a negotiation with the US Goverment to settle some of the land issues as it related to how Nevada did not receive the same State School Trust Land Grants that many other states received when admitted to the Union. If you look at most other western states, there are large chunks of State Trust Lands (usually blue on a map) that were granted to the states for purposes of funding the school systems. In Montana, in every Township, Sections 16 and 36 were granted to the state for funding of the school system. They are held in Trust by the State Land Board. All monies are earmarked to be distributed to the schools of Montana.
When this deal was struck with Nevada, the Federal Government stated that the land being transferred could not be sold for more than $1.25 per acre. Yeah, $1.25 per acre. Imagine what kind of corruption that created when the local politicians got to start handing out development land to their buddies that was probably worth $500 per acre, and they were able to direct it to their pals for $1.25 per acre.
While going to college in Nevada, I took a year of Nevada history, so some of this is recollection on dates. I think it was in 1955 +/- a few years that a big corruption scandal hit where state legisators and local politicians were peddling all of this state land to their pals. Some of the biggest names in Nevada business and politics were associated with the scandal. In exchange for making sure their buddies got the lands they wanted, for $1.25 per acre, a lot of the elected folks were given some big bribes. Imagine that.
That agreement with the Feds supposedly settled any remaining land claims that Nevada had. And in normal fashion, the politicians converted those public assets into some sort of private income strem for them and their pals.
I will try to research the details on this and post links. What I have posted is all going off memory from the classes in which I was paying attention. You don't see much state land left in Nevada, even after that Federal settlement. It all got sold (gifted) for $1.25 per acre back in the 1950's. I doubt any of the lands in the Bundy issue were part of that settlement and gifting to the wealthy.
From my recollection, that settlement resolved all land claims Nevada had against the Federal Government. And as such, there would probably be no claim that would substanitate that Nevada owned any of the BLM lands that Bundy had his cattle on.