As a regular misplacer of headcovers I share your frustration, however all is not lost (pun intended) as in my experience a quick call to the pro-shop to register your loss is invariably successful. You might have to wait a week or two (& it might turn up a bit soggy) but golfers are by-and-large an honest bunch and Royal North Devon isn't exactly a retreat for the nefarious & shady types who would steal. You could try Gary Milne at Exeter Golf & Country Club, when I needed a new headcover for my 905R driver he had one in stock that wasn't married to a club, other Titleist dealers may also be worth a try, you never know what old merchandise they have hanging around in the stock room. So keep the faith and it may well turn up. If not Scotty's custom shop will probably be your best bet for a genuine item (at a premium price).