DT3.04 Pro - Cannot delete from trash

Having overhauled my law library (all files in Dropbox then index to DT3) I want to perform File>Export>Database Archive. I do that regularly. with no issue. This time the log listed dozens of missing files so I went through the database deleting the missing files. One missing file is refusing to delete, even though it’s not in DT3 and the folder in which DT3 says it’s in no longer exists. In Empty Trash, I have tried clicking Only in Database and Files and Folders, quoting DT and relaunching, but to no avail.

Any suggestions?

I attach screenshots.

Is the item in the trash locked?

Thanks, I hadn’t thought of that, it was. All ok now.