bee, I thought you probably had figured it out (and you may have) but Finds hidden immunity idol doesn't appear in the list of how to earn points. I would have sworn it was there.
He may have got credit (it is 30 pts.) for finding an individual immunity idol under the heading of Wins Immunity (individual) even though he didn't technically win it and it wasn't at the immunity challenge.
Reads Tree Mail: Your team earns
10 points any time one of your Survivors reads aloud any part of the "Tree Mail".
Cries: Your team earns
12 points any time one of your Survivors sheds tears
Wins Immunity (group): Your team earns
25 points any time one of your Survivors is on the tribe that wins the Immunity Challenge.
Wins Immunity (individual): Your team earns
30 points any time one of your Survivors wins the individual Immunity Challenge.
Wins Reward Challenge (group): Your team earns
10 points any time one of your Survivors is on the tribe that wins a Reward Challenge.
Wins Reward Challenge (individual): Your team earns
20 points any time one of your Survivors wins the individual Reward Challenge.
Jeff Says Your Name: Your team earns
3 points any time Jeff Probst says the name of one of your Survivors.
Use of NOW Wireless Device: Your team earns
30 points any time on of your Survivors uses a Sprint NOW Wireless Device.
Chosen to share Reward Prize: Your team earns
10 points any time one of your Survivors is chosen to share a reward prize.
Given Immunity Idol by another survivor: Your team earns
15 points any time one of your Survivors is given an Immunity Idol by any other Survivor.
Sent to Exile Island: Your team
loses 18 points any time one of your Survivors visits Exile Island.
Sits Out Challenge: Your team
loses 12 points any time one of your Survivors does not take part in a group Challenge: Reward or Immunity.
Voted Off: Your team
loses 40 points when one of your Survivors gets voted off the island.
Gives Immunity Idol: Your team
loses 15 points any time one of your Survivors gives the Immunity Idol to another Survivor.
Receive Medical Attention: Your team
loses 10 points any time one of your Survivors receives professional medical attention from a Survivor Staff member.
Bonus Points/Ponderosa: You are awarded
30 points for correctly answering the Weekly Bonus Point question and/or the Ponderosa Extra Point question.