Contracts between private individuals are DIFFERENT than arrangements between individuals and governments.
BTW, it is common in much of the world for merchants to hire people to kidnap potential customers and drag them to their tents for trade. We don't do that.
Even a lowly assistant manager of Walmart understands that they are way off base in demanding that a bill of sale be presented to them in order for a citizen to maintain their liberty and freedom. Your rights do not end at their property line. We got rid of that fifedom system when we cast off the King. As our founders said “Exercise your rights or loose them”.
The man had the Constitution and the law of Virginia on his side.