Prosthetic legs returned; police stumped

Reuters headline on this story:

LOS ANGELES (Reuters) - Two prosthetic legs stolen from a 16-year-old California girl have mysteriously turned up in her mother's van, the second time in three months that an artificial limb belonging to the teen has been taken and then returned, police said on Friday.
Los Angeles County Sheriff's Sgt. David Austin said investigators dusted the slightly damaged limbs for fingerprints and had interviewed a "laundry list" of people but were baffled by the thefts.

This one is treading on the line of insensitivity.