Sale 1:

https://backpack.tf/profiles/76561198337734785#!/compare/1574121600/1574208000

https://backpack.tf/profiles/76561198285967572#!/compare/1574208000/1574467200

https://backpack.tf/profiles/76561198285967572#!/compare/1574467200/1574899200

https://backpack.tf/profiles/76561198337734785#!/compare/1574553600/1574640000

Sold then resold back

Sale 2:

https://backpack.tf/profiles/76561198337734785#!/compare/1575072000/1575158400

https://backpack.tf/profiles/76561198143613491#!/compare/1575849600/1576627200

Bulk / untrace

Sale 3:

https://backpack.tf/profiles/76561198337734785#!/compare/1573603200/1573689600

https://backpack.tf/profiles/76561198061207144#!/compare/1573430400/1573689600

Keys

Sale 4:

https://backpack.tf/profiles/76561198061207144#!/compare/1574380800/1574640000

https://backpack.tf/profiles/76561198337734785#!/compare/1574553600/1574640000

QS for ~27 keys

Sale 5:

https://backpack.tf/profiles/76561198337734785#!/compare/1576713600/1576800000

https://backpack.tf/profiles/76561197963995721#!/compare/1576800000/1576972800

Sold for ~29 keys

Sale 6:

https://backpack.tf/profiles/76561197963995721#!/compare/1577059200/1577836800

https://backpack.tf/profiles/76561198308772967#!/compare/1577145600/1577232000

QS

Sale 7:

https://marketplace.tf/items/tf2/174;5;u10

$52.05 / $1.80 = 28.92 keys

$66 / $1.80 = 36.67 keys

$44.44 / $1.79 = 24.83 keys

$64.24 / $1.75 = 36.71 keys <--- https://backpack.tf/item/268533338 DUPE

$49.99 / $1.67 = 29.93 keys

$49.99 / $1.77 = 28.24 keys <--- https://backpack.tf/item/268533338 DUPE

$61.99 / $1.78 = 34.83 keys

Total sales @:

25, 27, 29, 29, 30, 35, 37 keys

buyers up to 22 keys,

5 month unsold at 35 keys,

https://bot.tf/stats/listings/MGZOQR5Z

Unsold at 33 for ~1 month,

calling 35 high,

27 low,

taking 29 - 30 keys.