Question juridique clé
Whether the advance-of-costs orders were validly served despite the appellant's absence and changed address
Solution extraite
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.
Motifs extraits
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.