You may have a cause of action against the landlord if he removed your personal property. He may have committed a trespass as well, depending on the language of your lease which may require sufficient notice to enter the property. You could sue just him, because the other would have been agent's of his. And if you had to pay a deductible, you can tack that on to your damages because that's what you lost out of pocket.
This is not legal advice nor does it create an attorney-client relationship. This is for education and informational purposes only. It is always recommended that you contact an attorney with any concerns as each individual case is unique.
First, file a stolen property report with the police. Get a police report/case number. It is possible the police will contact the landlord and obtain the names and contact info of the workers and interview them all as part of their investigation. the longer you wait, the less likely they will get involved. Yes, you can sue, but proving one of them stole your camera can be tricky if you were not present and saw them take it. You would have to establish that no other persons besides yourself and the three who entered your home had the ability to access the property (in other words, there are no other residents or persons with keys and access to the premises). Even in that case, they can deny they took the item.