I don't know if Calibre saves it anywhere after it generates the MOBI file - I suspect the Calibre application only creates it as a temporary file during the process, and deletes it once the MOBI file is created.
However you can capture it by using the Debug feature in Calibre.
First, create a directory to put the debug files in.
Then, in Calibre, set up the "Convert Book" as normal.
Before initiating the conversion, click on the "Debug" item in the menu on the left of the conversion dialog, and select the directory you created as the output directory for the debug info.
Initiate the conversion.
Once the book has been converted, use Windows Explorer (or whatever file browser you prefer to use) to go to the directory you specified, and open the "Processed" sub-directory that you'll find there. That contains the raw files created at the end of the conversion process, immediately before Calibre packs the files into the MOBI format.
In there, you'll see the file "toc.ncx", which you can open with any plain text editor (you'll most likely need to open the editor first and then either use the "File Open" dialog to open the NCX file, or drag and drop the NCX file into the editor window to open it - on my system at least, I can't right click on the NCX file to select an application to open it with).
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