You should always consult with someone before discarding their things.
Jane's roommate moved out but left several items behind in the apartment.
Jane wants to get rid of her ex roommates things.
Jane contacts her ex roommate and tells them that they left things at the apartment.
Jane throws out her ex roommate's things into the garbage dumpster.
Jane's ex roommate is glad to have the items they forgot to take back.
Jane's roommate is upset that her forgotten things were just thrown away.