Resuggestion, many thanks to aj and Xergoyf.

Sale 1: https://backpack.tf/item/278285954

https://backpack.tf/profiles/76561198353865610#!/compare/1610150400/1610236800

https://backpack.tf/profiles/76561198260755782#!/compare/1610064000/1610236800

49 keys 27 ref, taking 50.

Sale 2: https://backpack.tf/item/245142570

https://backpack.tf/profiles/76561198337734785#!/compare/1611964800/1612051200

https://backpack.tf/profiles/76561198083514749#!/compare/1612051200/1612915200

Seems to be sold for a Strange Terror-Watt Galvanized Gibus and a Pumpkin Party Sir Pumpkinton (30.5, in date)

https://gladiator.tf/listings/6014a49c220a163ab986407c

BO was 49 keys 27 ref, no mini available for Strange TW Galvanized Gibus, so excluding this one.

Sale 3: https://backpack.tf/item/422683533

https://gyazo.com/ec0e7fca32040776006bf575ce7f314c

55 keys.

Sale 4: https://backpack.tf/item/827402089

https://backpack.tf/profiles/76561199085116273#!/compare/1616112000/1616198400

https://backpack.tf/profiles/76561198008449784#!/compare/1548201600/1616198400

Untraceable, the original owner seems to be cashing out, excluding.

Sale 5: https://backpack.tf/item/827402089

https://backpack.tf/profiles/76561199085116273#!/compare/1616803200/1616889600

Untraceable, BO was 56 keys but I'm not sure about it since I can't find it anywhere. Excluding as well.

No recent sales on mp.tf:

https://marketplace.tf/items/tf2/341;5;u09

Therefore, we only have 2 usable sales at 50 and 55, so going with this range.

https://backpack.tf/item/827402089

Phew, good thing I excluded it, it went to another bot's backpack.