Most likely someone delivered it to one of the police boxes.
There’s a high chance that someone delivered it to a nearby police box.
Someone probably delivered it to one of the police boxes.
❶Most likely someone delivered it to one of the police boxes.
(誰かが交番に届けた可能性は高いと思う)。
❷There’s a high chance that someone delivered it to a nearby police box.
(近くの交番に誰かが届けてくれた可能性は高いと思う)。
❸Someone probably delivered it to one of the police boxes.
(誰かがどれかの交番に届けたんじゃないかと思う)。
交番はpolice box です。
I think if someone picked it up, there's a pretty good chance they would have dropped it off at the neighbourhood police station.
この場合、次のような言い方ができますよ。
ーI think if someone picked it up, there's a pretty good chance they would have dropped it off at the neighbourhood police station.
「誰かが拾ってたら、交番に届けてる可能性が高いと思う」
to pick ... up で「…を拾う」
to drop ... off at the neighbourhood police station で「交番に…を届ける」
ご参考まで！
アメリカ合衆国 
カナダ 
