I DIDN'T CHERRY-PICK THE VON MISES QUOTE

Near the end of his book SOCIALISM, von Mises re-iterates his position on property and theft:

2 Violence and Authority

The attitude of mind which sees in private property a privilege of the owners is an echo from former periods in the history of property. All property ownership began with appropriation of ownerless things. The history of property passed through a period in which forcible dispossession of the owners was the rule. It is safe to say that the ownership of any piece of ground property can be traced back to seizure by violence.