Kernrechtsfrage
Whether the appeal to the Department was filed within the ten-day deadline.
Extrahierter Entscheid
No. The deadline began on 2018-02-10 after valid delivery on 2018-02-09 and expired on 2018-02-19; the appeal posted on 2018-02-21 was late.
Extrahierte Begründung
The running of legal time limits depends on proper service, not actual knowledge. Delivery by A-Post Plus to the mailbox on 2018-02-09 triggered the deadline regardless of the appellant's later awareness.