@Austin G
Sorry, I've no idea when I last saw the missing notes. I've a feeling that some notes I expected to show up in searches haven't been but I only scrolled down all notes today and found there's nothing before 2011.
1. But, first off, embarrassing but I'm wondering a bit now if I did only begin to use EN in 2011. I'd been using it a while before upgrading to Premium. Do you have a way of finding out when I upgraded to premium? That might help give me an indication. Though looking at those first 2011 notes, I am puzzled as they're to do with using EN with GTD and I do really think I'd been using it before finding some people have managed to set it up to work with GTD. Wondering if that's when I upgraded to Premium though.
2. By "local database" do you mean a file somewhere on my laptop, rather than an EN folder that I might have chosen not to sync on the web? If so, my problem is that my laptop broke earlier late March this year so I'm on a new one now. To add complications, the new laptop late March wasn't working properly so I had to send it back and get it replaced, I think in May. There's an .enex file on my backup external drived dated May 2020. Is there a way I can look on that to see if there are older files? If I try to import it, won't I have loads of duplicate notes?
But if notes vanished before late March, they won't be on that .enex anyway.
3. I do still have my Android phone but EN notes only go back to 2011 on that as well. Would there somehow be an EN file on the phone that goes back earlier? I guess not as it would have been overwritten.
4. When did EN v10 come out? I've seen posts mentioning swathes of old notes going missing when that came out, which is why I'm wondering if that's the problem and that somehow sync from laptop to web wiped notes from phone as well.
Which brings me back to point one - maybe I didn't start using EN till 2011 after all. Very embarrassing. But am v puzzled if so.