Sale 1:

https://backpack.tf/profiles/76561198086749028#!/compare/1586736000/1586908800

https://backpack.tf/profiles/76561198045656873#!/compare/1586217600/1587168000

Sold for 15 keys

sale 2:

https://backpack.tf/profiles/76561198045656873#!/compare/1587168000/1587600000

https://backpack.tf/profiles/76561198305494036#!/compare/1587427200/1587513600

Sold for ~13 keys

sale 3:

https://backpack.tf/profiles/76561198305494036#!/compare/1587600000/1587686400

https://backpack.tf/profiles/76561198252999692#!/compare/1587600000/1587686400

sold for keys

sale 4:

https://backpack.tf/profiles/76561198252999692#!/compare/1588809600/1588982400

https://backpack.tf/profiles/76561198252999692#!/compare/1588809600/1588982400

Keys

sale 5:

https://backpack.tf/profiles/76561198830746068#!/compare/1584057600/1584144000

https://backpack.tf/profiles/76561198353677528#!/compare/1584057600/1584144000

Untrace

sale 6:

https://backpack.tf/profiles/76561198353677528#!/compare/1584662400/1584748800

https://backpack.tf/profiles/76561197982127154#!/compare/1584662400/1584748800

sold for keys

sale 7:

https://backpack.tf/profiles/76561198353677528#!/compare/1584662400/1584748800

https://backpack.tf/profiles/76561198252999692#!/compare/1584748800/1584835200

https://backpack.tf/profiles/76561198972294135#!/compare/1584748800/1584835200

Bulk and bulk

sale 8:

https://backpack.tf/profiles/76561198972294135#!/compare/1584835200/1584921600

https://backpack.tf/profiles/76561198382115458#!/compare/1584835200/1584921600

Bulk

sale 9:

https://backpack.tf/profiles/76561198382115458#!/compare/1584921600/1585094400

https://backpack.tf/profiles/76561198082168552#!/compare/1585094400/1586217600

Sold for Miami Bucket + 6 keys

https://bot.tf/stats/listings/Y9QG2EJ0

B/O of 15 keys, easily caps by buyers.

sale 10:

https://backpack.tf/profiles/76561198277189244#!/compare/1581120000/1586044800

https://backpack.tf/profiles/76561198363395191#!/compare/1586131200/1586217600

Untrace

sale 11:

https://backpack.tf/profiles/76561198311320985#!/compare/1583107200/1583193600

https://backpack.tf/profiles/76561197982127154#!/compare/1583107200/1583193600

Bulk for keys

sale 12:

https://backpack.tf/profiles/76561197982127154#!/compare/1583452800/1583539200

https://backpack.tf/profiles/76561198859815156#!/compare/1583452800/1583539200

Sold for 13 keys

sale 13:

https://backpack.tf/profiles/76561198859815156#!/compare/1583539200/1583625600

https://backpack.tf/profiles/76561198867626964#!/compare/1583107200/1583971200

untrace

sale 14:

https://backpack.tf/profiles/76561198867626964#!/compare/1587168000/1587945600

https://backpack.tf/profiles/76561198867626964#!/compare/1587168000/1587945600

QS

sale 15:

https://backpack.tf/profiles/76561198985910282#!/compare/1587600000/1587686400

https://backpack.tf/profiles/76561198141923153#!/compare/1587600000/1587686400

Sold for ~16 keys

sale 16:

https://backpack.tf/profiles/76561198141923153#!/compare/1587686400/1587772800

https://backpack.tf/profiles/76561198305494036#!/compare/1587600000/1587686400

QS

sale 17:

https://backpack.tf/profiles/76561198305494036#!/compare/1587600000/1587686400

https://backpack.tf/profiles/76561198073323764#!/compare/1587686400/1587772800

Sold for ~14 keys

sale 18:

https://backpack.tf/profiles/76561198073323764#!/compare/1588291200/1588377600

https://backpack.tf/profiles/76561199020936069#!/compare/1587513600/1589068800

Sold for 14 keys

sale 19:

https://backpack.tf/profiles/76561198263938120#!/compare/1583452800/1584576000

https://backpack.tf/profiles/76561198064300299#!/compare/1584489600/1584576000

QS

sale 20:

https://backpack.tf/profiles/76561198064300299#!/compare/1584576000/1584662400

https://backpack.tf/profiles/76561198246050714#!/compare/1584489600/1585526400

Keys, at least 9

sale 21:

https://backpack.tf/profiles/76561198983490591#!/compare/1586995200/1587168000

https://backpack.tf/profiles/76561198021055079#!/compare/1587081600/1587168000

Bulk

sale 22:

https://marketplace.tf/items/tf2/183;5;u58

$30 / $1.70 = 17.65 keys

$28 / $1.70 = 16.47 keys <--- https://backpack.tf/item/4901358919

$29.17 / $1.79 = 16.30 keys <--- https://backpack.tf/item/7956990798

$33.33 / $1.90 = 17.54 keys

Total sales @:

13, 13, 14, 14, 15, 15, 16, 16, 16, 18, 18 keys

buyers up to ~14 keys,

new seller for 17 keys,

calling 18 high,

14 low,

taking 15 - 16 keys.