It's NOT a scavenger hunt!
Try not to hide your art somewhere it can't be found or can only be found through clues. The purpose of this isn't to create a game out of it, but anonymously leave out art for others. However, you can leave a business card or your poleproject's hashtag (i.e. #seapoleproject) and share that the art was found if they reach out.
While I cannot speak for the other poleproject chapters, the seapoleproject is not a scavenger hunt. Meaning, do not hide the art and post clues. The idea of this project is to create equal art accessibility, and certainly not waste. This is why choosing an area with a lot of foot traffic is best. It is sure to be seen, picked up, and loved.
If you're interested in participating in a scavenger hunt type game, I recommend Game of Shrooms, a yearly art scavenger hunt revolving around mushroom art :)