Key legal question
Whether the leased premises had been effectively returned despite a few items remaining in one room
Extracted holding
Yes. Return was effective once the tenant clearly manifested intent to leave, handed over all keys, and relinquished control; minor leftover items did not prevent restitution.
Extracted reasoning
Restitution under Art. 267 CO requires transfer of control, especially all keys. Since the landlord regained exclusive control on 2010-05-31, the premises were returned; any leftover items could at most support separate claims for removal costs.