A surprising number of people still keep their passwords tacked to the underside of their desk phone or its receiver. The worst offenders leave them on a post-it on their keyboard tray, or under the spot where their keyboard lives. Most people who work in open offices with short cubicles tend to lock their desk drawers. The master list of their usernames and passwords were almost always in the top drawer, on a scrap of paper or the top of a thick stack of post-its.”]
Source: https://lifehacker.com/the-most-common-hiding-places-for-workplace-passwords-5852667