Missing Files and they aren't in recently deleted files

Janinec if they are not showing on your pages and you do not have another account they are not on the Dropbox system, sorry. The Dropbox system logs everything on the Events tab so if not there then its not uploaded (or has been deleted etc.).

So from looking at your other posts (linked here) you installed and told Dropbox to do backup. However, if you didnt have enough quota they wont upload to Dropbox. Then if you uninstall it and dont do it correctly they are removed locally. There is no way, at all, via Dropbox to recover those files. They have not ever existed on its servers. They didnt upload. 

The other thing to note is that, unfortunately, even if they were deleted and uploaded at some point unless, at the time you did it, you were a paid user as its now over 30 days since your deletion they are also not recoverable. Dropbox only allows for 30 days of recovery on free accounts. There is no way, at all, to extend or recover beyond that.