I used this humidifier when I first bought it and then stored it for several years. There is some yellowing on the water tank and cord (see photo 5), and some staining on the bottom of the instruction manual (see photo 6). I have tested its operation with water and disinfected it with alcohol. Although I have dried it thoroughly, there may still be some water droplets remaining. Please be aware of this. The original box is not included. It's in very good condition as it wasn't used much, but please understand that this is a used item before purchasing.