Do the files actually appear on the Moodle site itself, then when you attempt to access them you get a 404?
If they don't and if the trash data in mdl_files isn't taking up a lot of space, then I'd suggest leaving it there really.
They can be "simply" removed from the database. Though in reality, your best option is to verify the data against the moodledata\files dir one by one. If you're feeling this adventurous then do make sure you do this on a clone of the site first, rather than the live site!
General help
i have issue
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