What is the way to stop repeated thefts of valuable items from the house, which began after a man and his jinn-possessed wife took up residence there, and why aren't all possessions stolen at once, and is it permissible to seek help from someone who uses jinn to find the location of sorcery after exhausting all legitimate means without success?

It is not permissible to seek help from Jinn. Their stealing of things is possible and may be an act of mischief and harm, or the Jinn may be commissioned by a sorcerer. In this case, one must seek a righteous healer to undo the sorcery.

It is recommended to increase acts of obedience, recite Surat Al-Baqarah, and mention the name of Allah when closing doors and covering vessels, because Satan flees from a house in which Surat Al-Baqarah is recited, and he cannot open what the name of Allah has been mentioned upon.