Kernrechtsfrage
Whether the appeal had to be entered into despite non-payment of the cost advance within the additional deadline.
Extrahierter Entscheid
No. Because the appellant did not pay the required advance even within the non-extendable additional deadline, the Federal Court did not enter into the appeal.
Extrahierte Begründung
Under Art. 62(1) and 62(3) BGG, a cost advance must be paid and failure to do so after a deadline and additional deadline leads to non-entry. The June 5 order was deemed served under Art. 44(2) BGG despite the return of the later mailing.