Giant Mimic

Scenario:
DM: As you walk through the dimly lit tunnel, You hear the sound of snoring echo throughout the frigid ice caverns. Slowly and stealthily you approach the opening to the side cavern from which the baritone sounds of slumber emanate. As you peek around the corner you see a huge cavern sparsely furnished with primitive table and chairs that look to be fashioned from rough logs lashed together. Lying beside the table and an overturned chair you see the source of the snoring. The blue body of a 2500 lb 22 ft tall frost giant sleeps in an awkward twisted position suggesting that he drank himself to sleep and fell out of his chair. A barrel of what is probably an alcoholic beverage is still clutched in his left hand and his gargantuan double bladed ax lies across his chest held tightly in his right. The room could easily be passed and the giant ignored except your eyes are drawn to an elaborate treasure chest easily eight feet tall. You begin to wonder if giants have giant gold pi