That is somewhat ironic and I have a pretty good idea I know what this is for. Simon's other company is Pelgrane press. They create roleplaying systems and associated material. One of their new systems/settings that is coming out real soon is called Mutant City Blues. It is a great setting and the system is really simple and fun to use. The system is called GUMSHOE and is specifically geared toward investigation type games. MCB has a nice twist though in that superpowers are real. The PCs are detectives with superpowers who use them to fight crime and solve cases. The level of superpowers is fairly low though. So the PCs are more like investigators that happen to have powers rather than powers in the shape of a character. I know this because I had the wonderful opportunity to playtest the game and run my local group through an adventure.
Anyway, regarding the objects everything looks really good except the dumpster and garbage bags. The inside of the dumpster is far too bright and clean, and the bags don't look like they have been tossed in. More like they have been carefully arranged.
I only point that out because in an investigation scenario (assuming my hunch is correct) something like what you have now on the map could mislead the players into asking a lot of red herring type questions. Yea, silly I know, but players can be strange beasts sometimes. LOL
I look forward to seeing the symbol set and final map when they publish it. Great stuff!