Mantle to set the core of the house.

https://backpack.tf/item/2231617183

Sale 1) ?

https://backpack.tf/profiles/76561198093707809#!/compare/1545264000/1545523200

https://backpack.tf/profiles/76561197993976532#!/compare/1545436800/1545782400

https://backpack.tf/item/2241967481

Sale 2) Bulk sale for a Sunbeams Master's Yellow Belt

https://backpack.tf/profiles/76561197973125935#!/compare/1550620800/1550707200

https://backpack.tf/item/2194071675

Sale 3) SCM sale

https://backpack.tf/profiles/76561198132741569#!/compare/1549584000/1549670400

https://backpack.tf/profiles/76561198059137448#!/compare/1549324800/1549929600

https://backpack.tf/item/2206684159

Sale 4) ?

https://backpack.tf/profiles/76561198066177907#!/compare/1544745600/1545177600

https://backpack.tf/profiles/76561198394453476#!/compare/1545091200/1545177600

Sale 5) Sold for 75 Keys

https://backpack.tf/profiles/76561198394453476#!/compare/1546128000/1546214400

https://backpack.tf/item/2210875335

Sale 6) ?

https://backpack.tf/profiles/76561198196565646#!/compare/NaN/1549756800

Sale 7) ?

https://backpack.tf/profiles/76561198453317142#!/compare/1551225600/1551657600

https://backpack.tf/profiles/76561198453530349#!/compare/1551225600/1551312000

https://backpack.tf/item/2214911290

Sale 8) Bulk sale for a Sunbeams Virtual Viewfinder

https://backpack.tf/profiles/76561198026659536#!/compare/1546905600/1546992000

Sale 9) Bulk sale for a Golden Frying Pan

https://backpack.tf/profiles/76561198803829026#!/compare/1547856000/1548028800

Sale 10) Sold for a Pro KS Black Rose (48 Keys) + Haunted Ghosts Infernal Impaler (39 Keys)

https://backpack.tf/profiles/76561198148511293#!/compare/1548028800/1548115200

https://backpack.tf/profiles/76561198042540572#!/compare/1548028800/1548115200

Taking 48 Keys as the Black Rose immediately sold for that, so it wasn't valued any higher.

48 + 39 = 87 Keys

Impaler Mini

https://backpack.tf/suggestion/5c7dbdbed3817240dc48fa49 - 39 Keys

https://backpack.tf/item/2222233749

Sale 11) ?

https://backpack.tf/profiles/76561198407204047#!/compare/1546560000/1546646400

https://backpack.tf/profiles/76561198070705963#!/compare/1546560000/1546646400

Sale 12) ?

https://backpack.tf/profiles/76561198070705963#!/compare/1546819200/1546905600

https://backpack.tf/profiles/76561198146627532#!/compare/1546819200/1546905600

Sale 13) Bulk sale

https://backpack.tf/profiles/76561198146627532#!/compare/1549238400/1549324800

https://backpack.tf/profiles/76561198114402400#!/compare/1549238400/1549324800

https://backpack.tf/item/2229834594

Sale 14) Sold for a Stormy Storm Bonk Boy (40 Keys) + 40 Keys

https://backpack.tf/profiles/76561198046172157#!/compare/1547596800/1547856000

https://backpack.tf/profiles/76561198310972287#!/compare/1547769600/1547856000

40 + 40 = 80 Keys

Sale 15) Bulk sale

https://backpack.tf/profiles/76561198310972287#!/compare/1547769600/1547856000

https://backpack.tf/profiles/76561198061779536#!/compare/1547769600/1547856000

Sale 16) Quicksold for 69 Keys

https://backpack.tf/profiles/76561198061779536#!/compare/1547856000/1547942400

Low outlier.

Sale 17) Quicksold for 74 Keys + ~1 Key of Items

https://steamuserimages-a.akamaihd.net/ugc/998016068154626753/CB0A5284A86DD5D569AD3D29835A1F1475A2CA90/ - Thanks, Marvelous

https://backpack.tf/item/2240666205

Sale 18) Sold for 35 Keys + Circling Heart Flipped Trilby

https://backpack.tf/profiles/76561198074821089#!/compare/1544659200/1546992000

https://backpack.tf/profiles/76561198256438505#!/compare/1546905600/1546992000

https://gyazo.com/287a7929434f256c4b9fb1e5005280a8 - Thanks, sakminis

Low outlier.

Sale 19) Sold for 67 Keys

https://backpack.tf/profiles/76561198256438505#!/compare/1547942400/1548288000

Low outlier.

Sale 20) Sold + ~13 Keys of Items for a Purple Energy Vive la France (100 Keys)

https://backpack.tf/profiles/76561198220612564#!/compare/1550275200/1550361600

https://backpack.tf/profiles/76561198168863803#!/compare/1550275200/1550361600

100 - 13 = 87 Keys

Sale 21) Bulk sale

https://backpack.tf/profiles/76561198168863803#!/compare/1551571200/1551657600

https://backpack.tf/profiles/76561198140316312#!/compare/1551571200/1551657600

https://cdn.discordapp.com/attachments/250356056855674880/552649581603848192/unknown.png - Thanks, Danny

https://marketplace.tf/items/1076;6 - Sold for $159.96, $159.94, $170, $170, and $114 (low Outlier)

Keys were $1.73, $1.80, $1.82, and $1.80 for those first 4 sales, respectively.

That makes the sales 92 Keys, 89 Keys, 93 Keys, and 94 Keys.

Sales at $126, $159.01, ~$196.65 x2, $170.22, $126.89, $167.16, $153.38, $136.25, $226.16, and $242.53

https://steamcommunity.com/market/listings/440/The%20Smissmas%20Caribou

https://steamcommunity.com/market/listings/440/Mann%20Co.%20Supply%20Crate%20Key

Keys were $2.19, $2.17, $2.19 x2, $2.32, $2.36, $2.37, $2.27, $2.18, $2.21, and $2.24 for those sales, respectively.

That makes the sales 58, 73, ~90 Keys x2, 73, 54, 71, 68, 63, 102 Keys, and 108 Keys.

Not using any of these since they're a) all over the place and b) essentially all (except the 2 I don't know the exact values of from the x2) outliers.

Counting 75 as low as well because 1 out of the 2 sales was a quicksale and there are Buyers at 75 Keys.

https://imgur.com/a/cTyVeig - 2 Sellers at 89 Keys, 1 Clean Seller at 89.5 Keys, 3 Buyers at 75 Keys

https://backpack.tf/item/2222233749

https://backpack.tf/item/2236578077

https://backpack.tf/item/2210875335

https://backpack.tf/u/76561198070705963

https://backpack.tf/u/76561198313364985

https://backpack.tf/u/76561198114402400