Yes, I'm sure I didn't lose it because I parked in front of a friend's store with the cap on and when I got out it was gone...
I installed the cord AFTER it was stolen...the joke cost me 50 euros...
Well, I think that if the guy is motivated he will break everything to steal it from me but at least I will have tried!
Proof that I'm not the only one to have had a cap stolen: on the new models there is a mechanical fixing for the radiator cap...
After checking the system, it seems to me that a few dots of silicone (automotive) placed on the cap (inner side... in contact with the plastic) should be enough to secure it.
Frankly, Triumph is making fun of the world when you see the crappy mountings on these caps; it's unacceptable given the overall quality and finish of this bike...