If you haven't seen those bogus updates, that's good. I've never seen an official update (with a padlock) either...so AFAIK there's no way to test this out.

I'd say just make sure that you keep on downloading LW from the official site. If you visit the LW site every once in a while, you'll see when there's been a version update

Just keep the other info in mind, in case you see some dodgy files in the future!