Free art on the streets of NYC...

I just received a anonymous email from "FREeAGENTZ" stating that there are some free art pieces out on the streets of NYC... and it is up to you to Find em\' Steal em\' Keep em\'!!! My hunch tells me that artists Phetus and Mr.Den have been up to no good... but I will leave the final verdict up to you all :-) Hit the Flickr site HERE to see if you recognize any of the locations!