Unless you actually have the locking key I don't see the point in keeping them, if you get a flat tyre one night you are royally stuffed.
Look on eBay for a new set to match your car (or go down the breakers and pick up a few nuts). Have them taken off (get Kwik Fit to do a "free" brake check, you never know, they might take them off for you
) and then just put the new ones on.
Cheaper than having to be recovered