Well he did until the feds told him he had to sign a contract which pretty much guaranteed they would use it to take his ranch.
Theoretically, if the feds were to get a civil judgement against Bundy(which they haven’t) over his failure to pay fees, they could try to get a lien on his personally owned property. But some states(like Texas) have homestead laws that prevent a man’s homestead from being taken to satisfy a civil judgement.