Betcha, alot of people saw it and assumed it was a normal advertising project. The artist waited til the end to add the ‘key’ word and fled.
No pun intended, but I would grill every employee in that CFA to find out what they know about this. I would start with the manager. That graffiti looks too professional and would have taken too long to do for just a couple of kids to paint it hastily overnight. Unless they were from the local art college. Which would be my next stop in the investigation. When they catch the perps, they should have them clean the side of the building with a toothbrush while the whole world watches!