An exmaple of the perfect PUN project

Hello dear developers. I have made like 3 or 4 multiplayer games using PUN, however those had been private prototypes. Now job requires me to do a prototype which might turn into a real game so there comes a question.

Is there some perfect project which follows PUN rules? I’d just like to have a look at how does it handle events which should occur on everyones PCs and normally occur in some managers.

There is not really a single perfect demo like that. It depends too much on what you want to achieve.
It might be worthwhile to explain what you plan to do, to get some concrete input.