That's because you've mixed it up. You're focusing on the grazing fees, rather than the fact that the Bundy's already owned the land in the first place. And yes, I was awarded a receipt, but where that receipt is now I couldn't tell you. In other words, I have as much proof that I own this computer as Bundy's family had to prove that they owned the land. Yet it's clear in both cases who the rightful owners of the property in question are. In the case of the computer, I am the obvious rightful owner. In the case of the land, the ranchers who mixed their labor with the unowned, unoccupied land are the owners of the land. Even if they don't have some deed saying that it's so.
Nope, Bundy NEVER had a receipt because he NEVER owned the land. You are right in that the rightful owner of Bundy's grazing land is obvious - it is the people of the United States of America. There is absolutely no legal argument to be made for anything else. From the very beginning there was an understanding that the land did not belong to the ranchers. The ranchers never made any improvements or put up fences, or erected any structures, or any of the other things that indicate ownership now did they?
Nope - because they understood from day 1 that this land was not theirs, but they would be allowed to graze their cattle their as long as they abide by the rules. The rules changed. This guy paid his fees for x number of years - an indication of his consent to the rules. Allowing cows to graze on the land is not "mixing work and the land." The cows who were grazing were the only ones doing any "work." So by your standard, the cows own the land.
Later - he decides he disagrees with the rules. He'll pay his grazing fees to the county, but not the Feds.
All these facts indicate that Bundy 1) acknowledged the land was not his 2) acknowledged his debt for grazing fees
Just because you suddenly don't agree with a law, doesn't mean you have the right to take up arms in order to disobey that law.
Your contention that Bundy (even though he doesn't realize it) owns the land, is indefensible.