don't have any specific examples offhand for front-office hirings, but i feel like i've seen "team X retained the services of [consulting firm] to identify candidates for [open position]" written quite a few times.
the most famous specific example isn't staff-focused, but player-focused. the browns paid six figures to a consulting firm to help them evaluate quarterbacks ahead of the 2014 draft. the consultants
recommended teddy bridgewater.
then jimmy haslam disregarded all of that (which may or may not have been
influenced by a conversation he had with a homeless gentleman at a stoplight) and went with johnny manziel.