While G was visiting Los Angeles, we had a great time talking shop, and walking the neighborhoods around Melrose and Fairfax where this postal sticker combo box was spotted.
Each sticker has a printed TYT on it, and then on each is a smaller hand written tag with two letters. Each sticker has a different two letter sequence, which seems to be the abbreviation for a state. From unknown artist, with G posing beside it in the top pic.
G is one of the most positive people we know, and it is always a blast hanging. Like G does in life, get up and stay up!
***Update -- apparently the stickers are from Night Writerz. Thanks to additional pic sent in from Calimail8***.