re-sugg although the sale is pretty old by now

https://backpack.tf/suggestion/6621b1205f1cbb3a8c044be0#comment-669da127bc412ed08203a2be

thanks PlantFoodClock for correcting me and for sales 4 and 5!

sale 1:

https://backpack.tf/profiles/76561199522478149#!/compare/1707696000/1707782400

https://backpack.tf/profiles/76561199183171982#!/compare/1707696000/1707782400

key histories track on sellers side

27 keys

buyer is currently selling for 24 keys on marketplace

https://marketplace.tf/items/tf2/30911;5;u290

sale 2:

https://backpack.tf/profiles/76561199106461781#!/compare/1707696000/1707782400

https://backpack.tf/item/929761314

https://backpack.tf/item/3788950639

seemingly sold with a Pumpkin Party Hazard Headgear and a Dead Presidents Condor Cap for something

seller is a scammer either way so not considering

sale 3:

https://imgur.com/a/sZQhBaY

https://steamcommunity.com/market/listings/440/Mann%20Co.%20Supply%20Crate%20Key

https://steamcommunity.com/market/listings/440/Unusual%20Fat%20Man%27s%20Field%20Cap

152.83 / 10.99 = ~ 14 keys

sale 4:

https://backpack.tf/profiles/76561198415625616#!/compare/1714348800/1714780800

https://backpack.tf/profiles/76561198124502543#!/compare/1713571200/1714780800

bulk

sale 5:

https://backpack.tf/profiles/76561198124502543#!/compare/1717200000/1717286400

https://backpack.tf/profiles/76561198244962432#!/compare/1717200000/1717286400

bulk