I make my life so difficult by making a lot of minis but I actually put a lot of effort into my suggestions, I'm sorry ;'D!

Marketplace.tf Sale #1:

Sold for $94.99 on February 7, 2019.

https://imgur.com/a/at4cZzH Keys at ~$1.81

95/1.81 = 52 keys

Sale #1

Sold for 42 keys pure (some keys don't show up at the buyer's profile but you can check the history on the keys on the seller's side!)-

Seller: https://backpack.tf/profiles/76561198024867201#!/compare/1550793600/1550880000

Buyer: https://backpack.tf/profiles/76561198084554383#!/compare/1550793600/1550880000

Sale #2:

Sold for a Circling TF Logo Rotation Sensation (36.5 keys) + a Roaring Rockets Taunt: The Bunnyhopper (4 keys) + 3 keys in pure = 43.5 keys-

Seller: https://backpack.tf/profiles/76561198059353114#!/compare/1547510400/1547596800

Buyer: https://backpack.tf/profiles/76561198188221001#!/compare/1547510400/1547596800

Mini for Roaring Rockets Taunt: The Bunnyhopper (4 keys)

Sale #1:

Sold for 4 keys pure + 8 refined (the taunt doesn't show up in the buyer's side since they trade it really quick after buying it so here's the history of the taunt!):

Seller: https://backpack.tf/profiles/76561197992703391#!/compare/1549411200/1549497600

Buyer: https://backpack.tf/profiles/76561198044684270#!/compare/1549411200/1549497600

History of the taunt: https://backpack.tf/item/6467762202

Mini for Circling TF Logo Rotation Sensation (36.5 keys)

Sale #1:

Sold for a Burning Flames Shooter's Sola Topi (34.5 keys)-

Seller: https://backpack.tf/profiles/76561198066434918#!/compare/1547596800/1547769600

Buyer: https://backpack.tf/profiles/76561198353909360#!/compare/1547683200/1547769600

Sale #2:

Sold with 6 keys for a Sunbeams Pyro's Beanie (44 keys) + 15 refined (44-6= 38 keys):

Seller: https://backpack.tf/profiles/76561198388578474#!/compare/1548201600/1548288000

Buyer: https://backpack.tf/profiles/76561198113899098#!/compare/1548201600/1548288000

Micro for Sunbeams Pyro's Beanie (44 keys)

Sale #1:

Sold for a dup Disco Beat Down Ol' Geezer (18.5 keys) + a Max's Severed Head (21.5 keys) + 1 key pure + 3ish keys in sweets = 44 keys (most of the items don't show up in the seller's backpack so here's the history of some of the items):

Seller: https://backpack.tf/profiles/76561198252999692#!/compare/1546387200/1546560000

Buyer: https://backpack.tf/profiles/76561198150210219#!/compare/1546387200/1546473600

History of the Max Head: https://backpack.tf/item/75740818

History of the Festive Backburner: https://backpack.tf/item/3331190110

We got this far down boyos! I don't know how to call this one since I only know about minis and micros so I'll just say its a minimicro ecks dee.

Minimicro for dup Disco Beat Down Ol' Geezer (18.5 keys)

Sale #1:

Sold for 21 keys pure-

Seller: https://backpack.tf/profiles/76561198043826027#!/compare/1550880000/1550966400

Buyer: https://backpack.tf/profiles/76561198195827886#!/compare/1549843200/1551139200

Sale #2:

Sold for 16 keys pure-

Seller: https://backpack.tf/profiles/76561198252999692#!/compare/1546560000/1546646400

Buyer: https://backpack.tf/profiles/76561198316708254#!/compare/1546473600/1546646400

Sorry if there's any mistakes, if there is please let me know so I can fix it as soon as possible, thank you!