Okay, so I just thought of something and I want to know your guy's opinion on it. I remember fondly when I would eat cereal and sometimes they would have little prizes in them. I thought maybe your holder or you could buy a couple boxes of cereal open them all (use bread clips or ziplock bags if you're afraid of the cereal going stale. so every day in the morning the wearer picks a box of cereal and the holder pours them a bowl (this way they can't cheat and just pour a shit ton) if nothing but cereal comes out, they enjoy their bowl. If the keys come out with the cereal (preferably wrapped in something so that it doesn't ruin the cereal its in or that it doesn't get mistakenly chewed on). Then the holder flips a coin or spins a wheel (however you like to do random chance). This will decide if the keys go back in a different box or if they wearer is free. Thoughts?
Interesting idea. Reminded me of the Kellogs variety packs which had 8 small single portion boxes of there range of cereals. A keyholder could hide little notes or instructions in each one so you could always enjoy a little surprise. A key might seem heavy or noticeable in a box so maybe it could be the code to a keybox. Also variety packs can be a bit pricey compared to larger boxes so maybe you can find a way of refilling the boxes with a larger box to keep the costs down.
Seems like a lot of messing about to me. If she wanted me to have the key she would just tell me to use it whilst I would be wondering what I had done wrong?