That's good to know, i thought mine had been sold before and somebody had tampered with them as the box had also been opened but they told me definitely not but it sounds like they could have been sold and somebody stripped the thread and then returned them. it seemed like the threads had been loctited in.
I wouldn't buy Dunlop again as mine seem to have an issue with the top bearings which is a known fault and Dunlop ignored every form of communication i tried so i would pay the extra and get Delphi