After going through the whole large house and not only the areas mentioned by the owner, Rein did found a lot of things that were indicating that a ghost was here but after a closer look, all of those things turned out to be false.
All the signs of the ghost that Rein and his team has managed to find were false and artificial. This was extremely disappointing to Lopas who was genuinely looking forward to seeing a ghost but at the same time, this was an clear indication that the ghost of this house was a fabrication that someone had created with unknown and probably evil intention.
But as it was clear from his previous spatial search, no one was in the house for the time being. So all this was set up by the mastermind before their arrival. For that reason, Rein and his group had no way to catch the culprit now.