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Doctor Duckworth AKA The Medical Mallard
https://backpack.tf/item/3425110224
Sale 1) Sold for 20 Keys
https://backpack.tf/profiles/76561198163238083#!/compare/1537660800/1537747200
Sale 2) Bulk sale for a Starstorm Slumber Brown Bomber
https://backpack.tf/profiles/76561198093145483#!/compare/1541721600/1541894400
https://marketplace.tf/items/398;5;u88 - Sold for $34.22 when Keys were ~$1.87 each
https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key
34.22 / 1.87 = 18.29, which rounds to 18 Keys