Well spotted!
There are a couple there, the boss uses them for storing cake paraphernalia.
We tend to get them as Christmas pressies, it's amazing what posh people will be convinced to eat
I just got the 3 tap. The scalloping of the compressor hump means the kegs sit further back so you can fit 4. I'll behaving 3 in there plus my new 2kg CO2 bottle. My wife is so impressed by the Series X that it's got a space reserved in the conservatory / garden room. I may even get a UK plug on it this week & plug it in