Ever walked into a cubicle and low and behold there's already a log in the pan? Usually with a little yellowy brown halo forming?
That's other people's ghost poos; that's where they go.
From the BBC report:
The force has executed 16 warrants so far in what has been named Operation Vanguard, adding it will also be carrying out land and underwater searches throughout the day.
Last I checked it was pretty far inland, it's Huyton, not Atlantis!