Size of the deleted files.

You are correct that the `/2/files/list_folder` endpoint does not include size information for deleted files.  Have you tried using the `/2/files/list_revisions` endpoint.  This endpoint will return a list of historical data about the file, including file size, and can be used on current files or deleted files.

No, I haven't looked at list_revisions. But this leads me to another question and that is about deleted folders. I guess deleted items can be restored, but I want to check the size of all deleted items. So which endpoint do I need to query to get the size of deleted files/folders.

I am surprised to see that Dropbox doesn't have an API to return just the deleted items.

You are correct that we don't have an endpoint to just list deleted files and folders.  This has been a feature request in the past.  I will add your interest to that request.   We also do not have an endpoint to return aggregate folder size.  Again, an existing request I can update with your interested.

As for how to compute this information today.  I suggest using "/files/list_folder" to compile a list of all deleted files. Then, for each deleted file in that list, use the "/files/list_revisions" endpoint to find the most recent file size of that file.