Possible Clues:

• Tiny chest, bust that's fake
• Amazingly tiny chest, produced artificially
• [Extremely stormy night here: movement's not natural]
• Fake copy finally found in battered tin chest
• Fake: tiny chest with boobs
• Perhaps Nancy's backtracked outside then recycled plastic?
• Casual pyrotechnist no pro and not natural
• Man-made (fibre)