Fetching details from the dictionary...

paper patch attached to something; paper backing; sticker; label
notice; poster
落し物のはり紙を電柱に貼った。
I posted a lost-and-found notice on a utility pole.
掲示板にはり紙をして参加者を募集した。
A notice was posted on the bulletin board to recruit participants.
窓にはり紙が貼ってある。
There's a notice posted on the window.