Media Bay still shows deleted files

I’m trying to reorganize my track presets.
I have deleted some files in Finder, maybe that’s not the best way to do it, but it’s the most familiar interface.
I thought I could refresh the Media Bay, kind of scan files again, but it doesn’t work as expected.
MB shows the file, but nothing happens when I drag the file into the project, so why isn’t deleted from the Database?
Any help much appreciated!