You posted it. Just read Art 1 Sec 8. The proof that you are wrong is right in front of your nose.
“Bundy Ranch
2 hours ago.
Ryan Payne one of the Main Militia who has been here protecting Cliven has reported it was HIS brother in law who reported the confiscating of weapons. This has been confirmed by Militia. If this happens to anyone else please call us or put it on blast, if you can get pictures, please do! Thank you for your support everybody!”
https://www.facebook.com/bundyranch
Sorry, you are incorrect. The plain reading of Article 1 Section 8 clearly shows that the US Government not only owns the land in question but has exclusive legislative authority over that land.