Key legal question
Whether the cantonal court could infer timely service and dismiss the appeal as late despite no proof of registered delivery
Extracted holding
No. The presumption of service was applied too loosely; without proof of registered delivery or sufficient evidence of dispatch and delivery time, the appeal could not be held untimely.
Extracted reasoning
The sender bears the burden of proving the date of service. Mere reference to the decision date, ordinary postal delivery time, and the recipient's silence after an inquiry was insufficient, especially where no warning about the consequences of silence was given.