detectiveではありません。
と言うか刑事ってpoliceだと思ってました

post
【verb [transitive]】
〔公共の場所に案内を〕貼る、掲示する
post up to put up a public notice about something on a wall or notice board
:The exam results were posted on the bulletin board yesterday.(L)
:The company posted a $1.1 billion loss.(O)
:A snow warning was posted for Ohio.(O)

●Japan Times:Sunday, April 4, 2010
Warming to Ryukyu culture
The entrance fee is ¥840 and a list of performance times is posted at the park entrance.