If I told you someone was gone and you took possession of their property w/o their permission, would it be wrong?
The owner of the personal property was not there, did not give his permission.
Advance notice: There may be a pop quiz tomorrow.
It all depends on how long the owner had been gone. With a renter, if they are more than one rent period overdue and visual indications are they have removed all/most of their belongings I might call the cops to perform a community caretaking function of securing abandoned personal property. But more liklely I would put the stuff into some form of storage along with a notice posted and mailed to the tenant's last known address (yeah, I know) so my backside would be covered if any complaint of theft were ever brought. Then I'd get a court order to sell the abandoned stuff in an attempt to recover moving and storage costs.
In other words, following the letter if not the spirit of the law will keep my backside out of trouble.
OTOH, if the owner was merely not present (on vacation, in the hospital, rotting in jail, but making sure the rent was paid) then touching his stuff is some varient of theft, along with some sort varient of B&E to get in there to touch it.
More importantly - say the tenant had several months left on their lease and was making regular rent (and utility) payments via some variation of electronic bill paying
but all their personal property was removed. What would you do? (Bonus points towards your own personal internets if you can properly name the program you are supposed to use to base your decision.)
stay safe.