Thread:NoWayThisUsernameIsAlreadyOwnedBySomeone/@comment-10228869-20160114190850/@comment-26143371-20160328221205

I'm not sure what will happen exactly, might be an error message, might be that the destination image gets overwritten.

But now that I think about it I can easily determine whether the files exist by simply making a list of links to them. Most will turn up as redlinks, and the ones that don't already exist.