I'm hoping that you never need this advice, but here is a helpful article on "what to do if a tenant abandons your rental property."
While you may want to just pack up their belongings and have a garage sale, legally it is very important that you follow the right steps.
Getting tired of managing your own AZ rental properties? How this specific situation would be handled is a GREAT question to ask prospective property management companies. Having a property manager with extensive experience can save you from landing in some very expensive hot water.
Have a fantastic weekend!