@Guru, I'm not entirely sure what you mean by "learn a lesson", but please note the implied accusation is not helpful or constructive.
I did not "mess around" with the file system prior to the notes disappearing. The issue originally occurred when I was using my computer in the normal course of my day. No "messing around"....
To reiterate, this is what happened leading up to the disappearance: I had Evernote open, and I was on the internet on Firefox or Safari (I don't recall) I recall switching to Evernote using Command+Tab, but when I clicked on the note I wanted to write it, the system beach-balled. My computer then gave me the message about my HD being full, and Evernote proceeded to close itself.
I cleared out files including an Application or two from the Applications folder, as well as files from the Documents Folder. I did not touch the "Library" folder, as it was hidden and at that point in time I didn't not even know it existed.
With some space clear, I re-opened Evernote, and it gave me an error about needing to re-index. When it then loaded, the notebook named "*****" and all of its notes were missing.
I spent at least an hour looking for where to submit a ticket to support, but when I load the ticket page, I do not see the form to complete. I assume this is because I am a "free" level client, and only Paying clients get to submit tickets, so I opened this thread.
Yesterday I did a search on my computer per your suggestion. I looked for words I knew to be in the missing notes. Search located the missing notes, and Finder showed me the path.
I appreciate your suggestions to look up the database. What can I do once I have located that?
I see the folder called "Purgatory", but it is empty.
The Mac search feature has identified the files to be located at the path I mentioned -- "User > Library > Containers > com.evernote.Evernote > Data > Library > CoreData > com.evernote.Evernote > A0D95BB7-56D2-41AC-83A2-03601324335A > ENNote > _records"
This is the only place on my machine where the files exist.
Is there a way I can "import" my missing notes from this location? What options do I have at this point?
Thank you all for your contributions and assistance in this issue.