A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
I'm still using Office 2013, so it might not work the same way, but refer to my posts of Oct. 27 and Nov. 15 2017. You might find files in one of the referenced locations even if they are not visible via Excel (or Word).
I found that I still sometimes have to hunt for autosave/autorecover documents in several different places. Other times, they show up in Backstage view or in the recovery panel. I haven't had time to figure out what the pattern is.
Good luck!