This is where we might find things looking hinky, so look at it and if you simply accept that some of the Masons believe this is so, I have made my point.
It did not take long to find this encrypted into George's biography, the one written by his personal physician. But I had already heard about George as "bulletproof" and a Visionary of Bible Prophecy too. The legend developed quite poetically by George LIPPARD for Rosicrucian in the 1840's too.
Please keep in mind my impression that the Masons are custodians, like Levi holding treasures awaiting the arrival of the Elect MELCHIZEDEK.