In the movie "Robot and Frank," Frank steals valuable jewelry with the help of a household robot. He hides the loot well enough that the police can not find it and he escapes punishment. At the end of the movie, he passes a note to his son saying that the jewelry was buried in a garden, but the son clearly does not take this seriously, though he knows his father was a thief. Presumably, the son believes that the father, whose dementia was well established by this point in the movie, does not know where the jewelry is. It was, after all, hidden by a robot whose memory was later wiped.
So, where is the loot? Was there some explicit clue earlier in the movie that I missed?