I haven't found any new replacement letters, but I've eliminated a lot of possibilities.
The disturbing conditions of will, life and organic forces are eliminated from the problem; he starts with the clear and distinct idea of extension, figured and moved, and thence by mathematical laws he gives a hypothetical explanation of all things.
But in OS measures index error can be eliminated by bisecting both stars with the same web (or different webs of known interval fixed on the same frame), and not employing the fixed web at all.
Perhaps Byrne was afraid someone would connect him to the theft, a fear that would be eliminated by his "death"—a fear that was turning out to be well founded.
The lunchtime pastrami more than eliminated the need for an early dinner, so he drove home, changed into shorts and set out at a leisurely pace on his 18-speed touring bike.