Sale 1:

https://backpack.tf/profiles/76561198864815072#!/compare/1549497600/1549756800

https://backpack.tf/profiles/76561198038307962#!/compare/1549670400/1549756800

Sold with 3 keys for Stormy Blast (15)

Total is 12 keys

https://bot.tf/stats/listings/4OK2GJGM

B/O of 13 keys

Sale 2:

https://backpack.tf/profiles/76561198038307962#!/compare/1549670400/1549756800

https://backpack.tf/profiles/76561198360265800#!/compare/1549756800/1549843200

Sold with negligible sweets for Searing Dead Cone

Cone Mini:

https://backpack.tf/suggestion/5cd8f79c678072522c561993

Suggestion for 16 keys

sale 3:

https://backpack.tf/profiles/76561198360265800#!/compare/1556755200/1556928000

https://backpack.tf/profiles/76561198206167299#!/compare/1555027200/1556928000

Sold with ~2 keys in sweets for Aussie Tomi(~15)

Total is 13 keys

Sale 4:

https://backpack.tf/profiles/76561198060787425#!/compare/1557100800/1557187200

https://backpack.tf/profiles/76561198349886701#!/compare/1557100800/1557187200

QS

Sale 5:

https://backpack.tf/profiles/76561198349886701#!/compare/1557446400/1557532800

https://backpack.tf/profiles/76561198288023134#!/compare/1557446400/1557532800

Sold for 12 keys

Sale 6:

https://backpack.tf/profiles/76561198178298931#!/compare/1550361600/1551744000

https://backpack.tf/profiles/76561198080179568#!/compare/1550534400/1550620800

QS

Sale 7:

https://backpack.tf/profiles/76561198080179568#!/compare/1552608000/1552694400

https://backpack.tf/profiles/76561198142755528#!/compare/1552608000/1552694400

Untrace, keys don't match...

Sale 8:

https://backpack.tf/profiles/76561198142755528#!/compare/1552694400/1552780800

https://backpack.tf/profiles/76561198379996789#!/compare/1552694400/1552780800

Sold with 4 keys for Searing Airdog(14)

Total is 10 keys

Sale 9:

https://backpack.tf/profiles/76561198379996789#!/compare/1552694400/1552780800

https://backpack.tf/profiles/76561198071588645#!/compare/1552694400/1552780800

https://backpack.tf/profiles/76561198089224738#!/compare/1552780800/1552867200

Untrace

Sale 10:

https://backpack.tf/profiles/76561198089224738#!/compare/1552953600/1553040000

https://backpack.tf/profiles/76561198337734785#!/compare/1552953600/1553040000

QS for ~10 keys

Sale 11,12:

https://marketplace.tf/items/52;5;u35

$21.99 / $1.79 = 12.28 keys

buy order

Total sales @:

10, 10, 12, 12, 12.28, 13, 16 keys

Seller for 13 keys,

buyers up to 10 keys,

gonna take 12 - 13 keys.