Question juridique clé
Whether the federal appeal could be entered into despite non-payment of the advance costs within the extended deadline.
Solution extraite
No. Because the appellant neither paid the advance costs nor proved timely payment as required, the appeal could not be heard.
Motifs extraits
After the warning under Art. 62(3) BGG, the appellant still failed to pay the CHF 2,000 advance or to provide the required proof of payment; therefore non-entry followed under Art. 108(1)(a) BGG.