Although that would be fun no one would take the risk and put something like that in the soil on the slim chance that I would find it. Where I live nobody would leave something of value or importance outside. Only a select few of my friends are aware of my extra curricular interests because most of them don't believe in it, none of which would play games, and my family doesn't live here.
1. too many plants for it to get lost in - it's intent is for butterflies, to help propagate the bee's, beauty and of course veggies cause I love them. No one likes the bee's except for me, so they stay out of the garden to avoid getting stung. Sometimes I do too if there are some ornery ones hanging around.
2. too many passerby's where it would catch someone else's eye than the person intended for and be taken, never to be seen or acknowledged by me
3. after the rains we've had recently it would be lost forever.
4. it was at the end of the property where I would least likely look - I just happened to at that particular moment because I tend to pace when I am on the phone, get fidgety and weed or clean while chit chatting.
If I thought someone had planted it there, I wouldn't have posted this. Thank you for your theory though

::big hugs for the grandpa!::