I have a few nuts that would be similar size to the one in the picture.

Take a few measurements and send them to me. I will check them against the nuts I have and can pop it in the post.

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Unfortunately smaller naked bikes are more likely to be moved than a large fully faired bike or a big chromed hog.

When I was starting out with bikes I had a few instances of my bike being moved - however once I broke into the 'big bikes' stage it was quite rare as just looking at it puts off most people of moving it.

I always used to keep it in gear when parked, good practice.

If my boss moved my bike without consent I would have no problem in going above his head to his boss and lodging a formal complaint. If I was feeling particularly vengeful (and flush) I would wait a few days then call a tow truck - simply ask him/her to move your boss' car to another parking spot. Just to give him a fright - and that it IS the same thing and that is how it feels.