Hi Carlos,
We cannot re-assign a new key as there is only one key which the folder was encrypted and that key is now missing or deleted.
We can just delete the whole encrypted folder if we don't want the data. If we want the data then we need the private key. We can check the pgp folder in documents folder to see if we can retreive the private key from backup keyring files.
We should be able to delete the folder if we no longer want to use this encrypted folder.
Regards,
Sarfaraz Rahman