Is it possible and has it happened where a note is thought to be a SNR and then down the road it becomes part of a larger range?
To straighten this out -- X_S, a small correction-- Suppose I find SNR 1234xxx range. It gets confirmed with findings. Therfore 1000 note range.
And then next week I find 1235xxx, and again it gets confiremd by other findings.
The range has been expanded into 2000.
Some new finds WILL bridge gaps between ranges, perhaps creating ranges of 3000 or 4000, maybe even more (of course we do not know for sure). Thus ranges can be absorbed into larger ranges. (Provided they are all SNR ranges).
The point to remember though, is that the relative numbers being found is still quite small.
There is a case with the $20s somewhere where a small SNR range is adjacent to the sheet range. They are listed as separate entries, due to the different nature of the note placement.
Some of the SNRs came from sheet ranges
This is a contradiction. X_S, please PM me with details.
However, I do acknowledge that BoC can throw us for a loop every now and again.