Thank you for your follow up.
Generally, if all tenants did not give a formal notice that the tenants have moved out, then the only legally safe way for the landlord to regain legal possession of the rental property is by filing a formal eviction against the tenants and once an eviction order is issued, the sheriff will commence an eviction and if there are any tenants' possession still remaining then such possession can legally be removed from the rental unit and placed on the curb of the road or at any other place where garbage gets picked up.
Here is the link to a website that has details about Alabama eviction process:
Also a claim for unpaid rent of up to $6,000 can be pursued in your local district court and if the court grants a judgment for the unpaid rent, then the judgment could be enforced by garnishing former tenants bank accounts, seizing vehicle or real estate property, etc...Here is the link to information about Alabama Small Claims Court Process:
I wish you the best of luck!