Kernrechtsfrage
Whether the complaint should be entered into despite non-payment of the advance costs after proper service attempts.
Extrahierter Entscheid
No entry was made because the advance costs were not paid within the prescribed time and the two service attempts must be borne by the appellant.
Extrahierte Begründung
Court notices are deemed served once they enter the addressee's sphere of control; a party must ensure receipt of procedural mail. After filing the complaint, the appellant had to arrange for receipt of official mail, and the non-payment justified non-entry under Art. 108 BGG.