Key legal question
Whether the Federal Supreme Court could enter into the appeal despite non-payment of the required cost advance within the extended deadline.
Extracted holding
No; because the advance was not paid even within the grace period, the appeal had to be dismissed without entering into the merits.
Extracted reasoning
Under Art. 62(3) BGG, failure to pay the requested advance after the additional deadline leads to non-entry in the simplified procedure under Art. 108(1)(a) BGG.