You're both joking, right?!

if i saw that i would be on the back of my truck

Why would someone go around putting up fake banksy stencils?

I have a drilling rat sprayed onto my wheelybin, just to identify it from others in the street. The stencils are freely available on ebay, as for why would someone put up fake banksy's who knows why, its been going on for years, there was a fake gangster rat on the wall outside andipa 5 years ago.

mucking about and cat amongst the pidgeons I'd guess... a recognisable image, all of a sudden there is a thread with "is it, isn't it?" questioning etc.... doubt there is any serious intent or reasoning behind it ( unless its an elderly resident hoping the wall gets removed by Vermin, thus allowing less restricted access to the land beyond the wall).

yup.