Item 1: https://backpack.tf/item/14625627881

Sale 1:

https://backpack.tf/profiles/76561198121966795#!/compare/1784419200/1784505600

https://backpack.tf/profiles/76561199111073161#!/compare/1784419200/1784505600

Dumped to Quicksell.Store in bulk for ~79 keys

Item 2: https://backpack.tf/item/6850548939

Sale 2:

https://backpack.tf/profiles/76561198349848918#!/compare/1783296000/1783382400

https://backpack.tf/profiles/76561198046531944#!/compare/1782950400/1783468800

Sold for 4 keys

Item 3: https://backpack.tf/item/5078484890

Quicksell.Store transfers

Item 4: https://backpack.tf/item/803340395

Sale 3:

https://backpack.tf/profiles/76561199564942025#!/compare/1785801600/1785888000

https://backpack.tf/profiles/76561199347761198#!/compare/1771632000/1785974400

Untrace

Sales:

4

Sellers and buyers:

BPTF - https://imgur.com/eOGExVW Seller at 4 keys, buyers up to 2.94 keys

MPTF - https://marketplace.tf/items/tf2/477;5;u3201 Seller at $9.99 (~5.3 keys)

STN - https://stntrading.eu/item/tf2/Unusual+Summer+Wave+Taunt%3A+The+Meet+the+Medic Buy order at ~3.05 keys

SCM - https://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20The%20Meet%20the%20Medic?appid=440&q=Summer+Wave https://imgur.com/ZevYE6l Buyers up to 5.37€ (~2.8 keys)

Going with 4 keys