Magical Eyes - Red is for Anguish

In the middle of the night on a certain day of April 201X, the left arm of the owner of a general store is chopped off in the backyard of his own store. 

Even though he claims that the perpetrator is a 'doll' that was kept in the store, his words carry little weight due to the lack of other witnesses. 

The doll and the detached arm are gone from the scene of crime.