Questione giuridica chiave
Whether the Federal Supreme Court could enter into the appeal despite the unpaid advance costs.
Decisione estratta
No. Because the appellant neither paid the advance costs nor proved timely payment within the non-extendable grace period, the court could not examine the appeal.
Motivazione estratta
After a warning under Art. 62(3) BGG, non-payment of the required advance costs entails non-entry under Art. 108(1)(a) BGG.