Goodness me Bee, a pedigree cat of that breed (we call them 'Persian' here) is very valuable. Someone must have paid a lot of money for him. Here it costs about £700 at least for a Persian kitten, and that would just be what's known as 'pet quality' (not sufficiently perfect for Cat Shows).
I wonder if he's been micro-chipped?

I can't imagine how anyone could be so blooming cruel as to abandon an unwanted cat far from home, it's a wicked thing to do isn't it?

It's so tricky knowing what to do with food-begging cats. Are they someone's pet? Are they lost and starving? Are they just trying it on?
I reckon your idea of attaching a note to a collar is favourite. If there's no response, off come his nuts!