Tenant Theft: Is this a civil or criminal?

[Donny Random]

Tenant broken lock off crawlspace door and stole lawnmower.
Would this be a civil or criminal matter?

[Randy E.]

Originally posted by @Donny Random:

I don't have proof besides that on the day that the tenant moved out the lock was broken and the lawnmower was gone.

 Speaking as someone who is not a lawyer and not a police officer, I don't think that counts as incontrovertible evidence that the tenant committed the crime.

I would repair the damage to the door and stop storing my lawnmower under the rental property.