Treasure Photo (Fireplace)

Processing Area, Meat Storage: metal shelves in the NW corner, by the pots and pans.

"I hid something nice here." Carry it and examine the loose stone of the Drawing Room fireplace (Main House 1F, the large stone on the right): out comes a Steroids.

Having carried it once is enough; you can drop it afterwards. The hidden item is lost once you leave the estate at the end of chapter 5.