Question juridique clé
Whether the cantonal authority violated the inquisitorial principle by not further investigating the painting's location.
Solution extraite
No violation: the file sufficiently supported the finding that the painting was in Switzerland when seized, and additional measures would not have changed the result.
Motifs extraits
The supervisory authority must establish relevant facts ex officio, but parties must cooperate. On the dossier, the debtor's own statements and the enforcement record supported Swiss location at the time of seizure; further evidence requested by the appellant would not have been decisive.