Key legal question
Whether the appeal could be entered into despite failure to pay the advance costs in time.
Extracted holding
No. Because the advance costs were not paid within the deadline, the appeal was not entered into under the warning given.
Extracted reasoning
The payment deadline, including the supplementary deadline under Art. 62(3) BGG, expired unused. The notices were deemed served even though returned marked 'not collected' under Art. 44(2) BGG. The court therefore applied non-entry procedure under Art. 108 BGG.