This is the 15357th most frequent Russian word.
похищенного
"Abducted" or "stolen."
Here, 'похищенного' is the past passive participle used as an adjective to describe the person who has been kidnapped.
Полиция нашла место укрытия похищенного человека.
The police found the hiding place of the kidnapped person.
In this instance, 'похищенного' is functioning as an adjective to qualify the noun 'предмета' (item), indicating that the item was stolen.
Расположение похищенного предмета было неизвестно.
The location of the stolen item was unknown.
In this case, 'похищенного' is being used substantively, where the participle functions as a noun referring to the kidnapped individual directly.