(Crujones4433 said Brody may need to have his eyes checked, as he eventually used zoomed-in photos of the clue. But it paid off.) "Under a bench you can see from Grandma's balcony."
According to the original Reddit thread, the check was for $80, which was just enough to put the lucky birthday boy over the top for the scooter he had been saving up for. Great ending, huh?