C. Heart Casemaker

Sale 1: 155 USD on mp.tf; 1 key = 1.92 USD --> 80.7; rounding to 81 keys

https://marketplace.tf/items/30119;5;u19

Sale 2: Sold for Sunbeams Antarctic Eyewear (105) + 5 keys pure --> 110

https://backpack.tf/profiles/76561198065152705#!/compare/1525824000/1525910400

Sale 3: Sold for Stare From Beyond Dr's Dapper Topper (160) and ~8.5 keys of sweets --> 168.5; rounding to 169

https://backpack.tf/profiles/76561198081793950#!/compare/1527724800/1527811200

https://backpack.tf/profiles/76561198161418980#!/compare/1527724800/1527811200

B/O: 200 http://www.tf2outpost.com/trade/29511266

Sale 4: Sold together with ~3 keys sweets for Burning Flames Towering Pillar of Hats (108) --> 105

https://backpack.tf/profiles/76561198282372085#!/compare/1528588800/1528675200

Mini Pillar: 214.31 USD on mp.tf; 1 key = 1.99 USD --> 107.6; rounding to 108 keys

https://marketplace.tf/items/135;5;u13 https://backpack.tf/item/242443615

Sale 5: Sold for Disco Beat Down Brotherhood of Arms + Max (18)

https://backpack.tf/profiles/76561198159593026#!/compare/1526860800/1526947200

https://backpack.tf/profiles/76561198046461179#!/compare/1526860800/1526947200

Being used to update the BoA here: https://backpack.tf/suggestion/5b163bdb44325a7d0414d98c

Sale 6: Sold for Frostbite Doctor's Sack via scrap auction

https://backpack.tf/profiles/76561198275541610#!/compare/1526083200/1526860800

https://backpack.tf/profiles/76561198096247397#!/compare/1526774400/1526947200

B/O: 150 http://www.tf2outpost.com/trade/29650692

Should be used to update the Sack which has a 3 years old price.

Sale 7: Bulk

https://backpack.tf/profiles/76561198169018746#!/compare/1528416000/1528502400

https://backpack.tf/profiles/76561198232041512#!/compare/1528416000/1528502400

Sale 8: Untraceable

https://backpack.tf/profiles/76561198152813004#!/compare/1523232000/1524096000

https://backpack.tf/profiles/76561198169018746#!/compare/1522972800/1524009600

Sale 9: Untraceable

https://backpack.tf/profiles/76561198282372085#!/compare/1529020800/1529107200

Sale 10: Untraceable

https://backpack.tf/profiles/76561197973029544#!/compare/1529280000/1529366400

2 sellers at 130. Buyer at 40 https://i.imgur.com/pLGOg9u.png

Sales at: 81, 105 110, 169. Calling 169 a high outlier based on A) the other 3 sales and B) the sellers below it.

Suggesting range from 81 to 110. Not rounding 81 to due being a cash sale.

Sale 11: 80 keys pure

https://backpack.tf/profiles/76561198176125115#!/compare/1532649600/1532736000

Sale 12: Sold for Blizzardy Storm Berliner's Bucket Helm + Smoking Black Watch + 3 pure + Green Energy Puffy Polar Cap

https://backpack.tf/profiles/76561197973029544#!/compare/1529798400/1529884800

Should support the low-end.

Sale 13: Sold with Electrostatic Armored Authority + 7 pure for Strange Scorching Flames Bot Dogger

https://backpack.tf/profiles/76561198174203179#!/compare/1529884800/1529971200

Being used here: https://backpack.tf/suggestion/5b5a3f7944325a4b9557bfba

Sale 14: Bulk

https://backpack.tf/profiles/76561198294070108#!/compare/1530057600/1530144000

Sale 15: Can maybe be used on Purple Energy Antarctic Eyewear?

https://backpack.tf/profiles/76561198294070108#!/compare/1530316800/1530403200

Not really worth it to resuggest 80 to110.