Board Thread:Skyrim/@comment-109.149.81.180-20140113021915/@comment-6881629-20150810152750

The list of all the keys and their id's is here, to remove one key to the Abandoned Prison the command would be -

player.removeitem 000E94D4 1

Change the id code and number (if you have more than one) to match the key you want to get rid off.