Update!

Sale 1: https://backpack.tf/profiles/76561198211377312#!/compare/1710201600/1711238400

https://backpack.tf/profiles/76561198003298603#!/compare/1711152000/1711238400

300 pure.

Sale 2: https://backpack.tf/profiles/76561199059698603#!/compare/1709596800/1709683200

https://backpack.tf/profiles/76561198090373633#!/compare/1709510400/1709683200

Sold for a Strange Professional Killstreak Gunslinger (243 keys) + a Cloud 9 Dragonborn Helmet (taking 20 as a non-suggestion mini) + a Kill-a-Watt Pugilist's Protector (buyers for it at ~8: https://i.imgur.com/mKuzw1A.png) + a Fairy Lights Frigid Fashion (~32 keys) + a Strange Radiant Legacy Clue Hairdo (52 keys) + a Fairy Lights Impact Impaler (18 keys)

243 + 20 + 8 + 32 + 52 + 18 = 373, no buyout to be traced.

https://backpack.tf/item/10583325958 - The Circling Heart Shutterbug matches as well on the buyer side, but seems to be unrelated to the Duck.

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Mini for Hairdo: https://backpack.tf/suggestion/661d4b24b1ed82b6750898d1

Mini for Impact: https://backpack.tf/suggestion/661d4b29d5395b5b49069b22

Mini for Frigid: https://backpack.tf/suggestion/661d4b2e356449a18207b858

Only sales for Dragon:

Sale 1: https://backpack.tf/profiles/76561199085116273#!/compare/1711152000/1711238400

https://backpack.tf/profiles/76561199376209312#!/compare/1711152000/1711238400

Sold with a few Heavy cosmetics for 20 pure.

Sale 2: https://backpack.tf/profiles/76561199376209312#!/compare/1711497600/1711584000

https://backpack.tf/profiles/76561199183171982#!/compare/1711497600/1711584000

Dumped in bulk for pure a few days later.

Only sale for Pugilist:

Sale 1: https://backpack.tf/profiles/76561197991401948#!/compare/1707350400/1707436800

https://backpack.tf/profiles/76561199581722058#!/compare/1707350400/1707436800

Sold multiple hats to the same stn bot, untrace.

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Sale 3: https://backpack.tf/profiles/76561198090373633#!/compare/1709683200/1709942400

https://backpack.tf/profiles/76561199315621199#!/compare/1709856000/1709942400

Some sort of bulk, but multiple things match all over both compares.

Classies: https://i.imgur.com/VQcUbwR.png. Do tell me if the qs.store sale is a bit too iffy to be used, seems pretty ok to use from all I was able to gather. 300-375.