Minutes after I posted, the doorbell rang, and sure enough it was someone who lives one or two streets over, dropping off my package that got misdelivered to their house. Annoying that it happened, but I'm so relieved they found it and brought it by!
And yes! THAT is what I'd imagine a graffiti bag should look like, not just random paint splatter. Even if it's not to my personal taste, I can definitely respect someone customizing or modifying a bag as long as it's well executed. There's a subreddit I check out sometimes called "Awful Taste but Good Execution", but it seems that all too often the painting on vintage bags could best be described as "Awful Taste and Terrible Execution".