Key legal question
Whether the advance-of-costs orders were validly served despite the appellant's absence and changed address
Extracted holding
Yes. The notices were deemed received under Art. 44(2) LTF after unsuccessful delivery attempts, and the appellant had to organize forwarding or appoint a representative.
Extracted reasoning
A party who leaves the address communicated to the authorities must ensure mail forwarding, notify a reachable address, or appoint an authorized representative; otherwise, the party cannot rely on absence from the delivery address.