I'll bet it has something to do with there being no actual copy of the Bill of Rights as written. As I understand it, there were not 10 Amendments. There was one Amendment with twelve articles submitted to the states for ratification. Only ten of the articles were ratified by the states. Any page that had all twelve articles can't be the "Bill of Rights" because it has two articles that were not ratified.
Interesting piece of history: the last amendment, the 27th Amendment, was among the first proposed back in 1789. It limits pay raises for Congress. It was one of those original twelve articles of amendment. One of the two that were not ratified in 1791. Some sharp fellow realized that several states did ratify it in the Founding period, and that it only had so many states to go before it would become operative. So, he got busy and worked on getting it pushed through in enough states. He realized he didn't have to start from scratch. You see, once a state ratifies it, that state's ratification counts forever. Even if a whole bunch of others don't ratify it. You don't start all over and re-submit it for ratification to every state. You can just pick up where it left off and try again even 200 years later.