I am not sure how much of this is true. I think the government protests too loudly.
We have not heard the full of this here in North Dakota either. At no point has anyone heard that the sheriff had a warrant to enter the property nor have we learned that the cattle were actually recovered from the ranch. I, too, will resort to arms to prevent government agents entering my property without permission or a warrant. Just because some neighbor who may not keep up his fences claims I have his stray cattle is not grounds for a warrant. If I do have his cattle as a result of them wandering through down fences that are responsability of the neighbor, he is liable for damages.