Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 5 years ago
Bismihi ta'ala
Yes, it would be considered as theft, as the owners could have a next-of-kin, or someone responsible for their belongings, and you must find who that is. It might even be the real estate agent, or the local council.
Yes, you can take care of their belongings, as amanah, until you find their rightful owners, and then ask permission from them.
And Allah knows best.