First sell:41 keys pure

Item history https://backpack.tf/item/7755138523

Seller https://backpack.tf/profiles/76561198145587672#!/compare/1559174400/1559260800

Buyer https://backpack.tf/profiles/76561198107793922#!/compare/1558742400/1559174400

Check keys history in nictator compare.

Second sell:41 keys pure

Item history https://backpack.tf/item/7704241291

Seller https://backpack.tf/profiles/76561198115160019#!/compare/1555977600/1556064000(compare is bugged)

Buyer https://backpack.tf/profiles/76561198341171690#!/compare/1555977600/1556064000

Check keys history in BooBot's compare,and pay attention on date of trading,if i was not wrong i count 41 key

Third sell:45 keys pure

Item history https://backpack.tf/item/7713695977

Seller https://backpack.tf/profiles/76561198101327173#!/compare/1558915200/1559088000

3 sellers on market,lowest price is 50 keys

Highest buyer is 38 keys

Thanks for TF2scourge and Master of the Hellish Yard for help!