Sale 1:

https://backpack.tf/profiles/76561198305494036#!/compare/1586736000/1586822400

https://backpack.tf/profiles/76561198131081286#!/compare/1586736000/1586908800

sold for 30 keys

sale 2:

https://backpack.tf/profiles/76561198131081286#!/compare/1586995200/1587081600

https://backpack.tf/profiles/76561198065749444#!/compare/1586908800/1586995200

Sold for Bubbling Fragger + 22 keys

Fragger Mini:

https://backpack.tf/suggestion/5ea637000b8e69298a403467

Suggestion for 19 keys

Total is 41 keys

https://bot.tf/stats/listings/MXXPZ1DD

B/O of 42 keys

sale 3:

https://backpack.tf/profiles/76561198065749444#!/compare/1587513600/1587600000

https://backpack.tf/profiles/76561198238966006#!/compare/1587600000/1587686400

sold for Miami Charmer + ~10 keys in sweets

Charmer mini:

https://backpack.tf/suggestion/5ea6354d5987d02f73493c37

suggestion for 30.5 keys

total is 40.5 keys

https://bot.tf/stats/listings/4WX9N8Q0

B/O of 42 keys

sale 4:

https://backpack.tf/profiles/76561198238966006#!/compare/1587686400/1587772800

https://backpack.tf/profiles/76561198146662901#!/compare/1587686400/1587772800

sold for CTFL HoC + 6 keys

HoC Mini:

https://backpack.tf/suggestion/5ea641808217ac6cba72605b

Suggestion for 22 keys

Total is 28 keys

Sale 5:

https://backpack.tf/profiles/76561198146662901#!/compare/1587686400/1587772800

https://backpack.tf/profiles/76561198173442901#!/compare/1587686400/1587772800

Bulk

sale 6:

https://marketplace.tf/items/tf2/49;5;u14

$34.4 / $1.72 = 20.00 keys

$48 / $1.69 = 28.40 keys

$52 / $1.72 = 30.23 keys

Total sales @:

20, 28, 28, 30, 30, 40.5, 41 keys

buyers up to ~26 keys,

seller at 40 keys,

considering 40.5 resold for way lower,

taking 28 - 30 keys