What is the ruling on devices that were serviced and then left by their owners for sale on their behalf, after the shop was robbed, and is it obligatory to return their price to their owners, knowing that there are stolen items belonging to the shop owner?

The Fatwa's Summary: The liability of a joint contractor is a matter of dispute. If the devices left by their owners for maintenance are stolen without any negligence on the part of the questioner, then he is not liable. However, if it occurred due to his negligence, then he is liable. As for the devices left by their owners with the questioner for him to sell, they are considered a trust (amanah), and an agent is not liable except in cases of negligence or transgression. Therefore, if the theft occurred due to the questioner's negligence, he is liable, but if it happened without any negligence on his part, then he is not liable.