Surprised no one resuggested this one a month ago, hopefully this is just in-date by enough to get it done.

(Credits to Elipoplefish and 13.t)

Sale 1

https://backpack.tf/profiles/76561198102442712#!/compare/1501459200/1501545600

Sold with a Bubbling Détective Noir (15.5, outdated) for a Sulphurous Détective Noir (58, outdated)

Mini for bubbling Noir: https://backpack.tf/profiles/76561198050144913#!/compare/1501718400/1501804800 13 keys pure

Unable to find a usable mini for the Sulphurous Détective Noir, taking bp.tf price of 58

Found a single sale here for the Sulphurous Noir: https://backpack.tf/profiles/76561198016070169#!/compare/1503878400/1504224000

Can't find a sale on the hive minder, so I'm going with 17.

43+17 = 60 - 13 = 47

Sale 2

https://backpack.tf/profiles/76561198102442712#!/compare/1502236800/1502323200

Sold for a Flaming Lantern Stout Shako (22, in-date), Blizz. Elf Esteem (14.5, rounding to 15, in-date) and 2 keys

22 + 15 + 2 = 39

Sale 3

https://backpack.tf/profiles/76561198337244899#!/compare/1504828800/1504915200

Sold for a Blizz. Hot Dogger (30, outdated) and 7 keys pure

Dogger Mini: https://backpack.tf/profiles/76561198366562680#!/compare/1505520000/1505606400

Both hats included are in-date (and equal the hat's outdated price), and a key was added. Sweets are not included because they can't be rounded up.

30 + 7 = 37

Not sure on the range since there are two lower end sales, so I wouldn't mind some insight.