Finder doesn't allow me to delete 2 particular files
Sometime ago I backed up the contents of an old iBook to my NAS. I have since transferred those files to my new iMac.
The problem: when I try to delete two of those files/folders from the NAS, this happens:
FOLDER 1:
Finder asks for my admin credentials and spits the following error:
But as you can see bellow the folder isn't locked and the Sharing and Permissions state that I can only read:
FOLDER 2:
In this case Finder does one of two things: either deletes it and the file comes back the next second OR spits the following error:
So, how can I delete these files/folders?