Regina sends the Huntsman out to kill Snow White and bring her heart as proof of death but he gives her the heart of a stag instead, which she puts in an ornate box. This is a reference to the Disney movie Snow White and the Seven Dwarfs, where the queen demands that the huntsman returns with Snow White's heart in a jeweled box as proof of the deed, and the huntsman brings back a pig's heart instead.
(in the fairytale, she orders him to bring back her lungs and liver and the huntsman presents the queen with the lungs and liver of a wild boar to fake Snow White's death)