Living Doll - S7-E24
Corrected entry: In "Living Doll," you see Natalie, while working as a cleaning woman, push her cart down the hall of the CSI lab with the miniture on it to place it on Grissom's desk. In Episode 7-11, "Leaving Las Vegas" (when the minature is delivered) you see a man placing it on the desk.
Correction: The model the deliveryman leaves on Gils desk is the scene of the Doctor who was killed by Carbon Monoxide Poisoning with the device in the fire, The model that Natalie ledt was the scene of the car on top of Sara so not an error.
Steven Gee