3. The policeman must have thought that the suitcase contained something suspicious, such as a high amount of money, but it was empty because the man had just bought it from a store.
4. Their car could have broke down and they either had to arrive to a formal event or they were coming from a formal event.
5. He could have locked himself outside by accident after he went out to inspect a strange noise in the garden and climbing was the only way to get back into the house.
6. He could have dropped something important and small, such as an expensive bracelet or his house keys.
