Take this for what you will because there isn't an opossum within a thousand miles of me.
Possums can be a threat to your chickens that much I know.
Just because somebody hasn't had a problem with them doesn't mean they won't in the future.
If it were me I would do things to dissuade the possum from coming around as others have suggested.
And if you do catch another one in your trap I would encourage you to dispatch the animal and properly dispose of the carcass.
I've been fortunate not to have any predators kill any of my chickens.
But I've killed a couple on my property and set out traps just to be sure I don't have problems in the future.
Possums can be a threat to your chickens that much I know.
Just because somebody hasn't had a problem with them doesn't mean they won't in the future.
If it were me I would do things to dissuade the possum from coming around as others have suggested.
And if you do catch another one in your trap I would encourage you to dispatch the animal and properly dispose of the carcass.
I've been fortunate not to have any predators kill any of my chickens.
But I've killed a couple on my property and set out traps just to be sure I don't have problems in the future.