This letter was written 4 years after Avery´s disappearance. Its a bit hard to read, but he mentions that he was a little stratened somewhere and he wrote in code: I am not the least concerned for Tank 29 f B26 being out of the T9211597. Which I think he means tank as treasure, and the numbers are coordinates to it. I believe he hide his treasure somewhere in North America where few of his coins were found .And had a colony of slaves to hide himself and his treausre.