Faith Stolen/Faith Misplaced: How do Dealers do Due Diligence? (31)

According to the social media site 'Lost Arts of Nepal' @LostArtsofNepal [1,883 Followers] (Faith Stolen – Breaking News Oct 5 ):

"This 17th Century Image of TARA, Stolen in the 1980s From a Buddhist Monastery Named CHILANCHO STUPA, KIRTIPUR, Has Been Located Sold at the Christie's Auction, Paris, France, 2017.

How was the collection history and therefore legitimacy of this object checked by the vendors, and where is this piece now?