Credits to Shuffle Spy!

Purple Aztec

https://backpack.tf/item/7331708248

Sale 1) Bulk sale

https://backpack.tf/profiles/76561198218497692#!/compare/1612310400/1612396800

Sale 2) Sold for a Distant Dream Patriot Peak (282.5 Keys) + 58 Keys + Smoking Cloud Crasher (10.5 Keys)

https://backpack.tf/profiles/76561198218497692#!/compare/1612396800/1612483200 - 43 Keys show

https://backpack.tf/profiles/76561198263190057#!/compare/1612137600/1612483200 - The Cloud shows

https://backpack.tf/profiles/76561198032481426#!/compare/1612310400/1612483200 - 15 Keys show

282.5 + 58 + 10.5 = 351, which can be rounded to 350 Keys

Peak Mini

https://backpack.tf/suggestion/6080ef160da86976995dd2b0 - 282.5 Keys

Crasher Mini

https://backpack.tf/profiles/76561198032481426#!/compare/1612656000/1612915200 - Sold for 7 Keys + Collector's Festive FaN Set (3 Keys)

https://steamcommunity.com/market/listings/440/Collector%27s%20Festive%20Force-A-Nature%20Chemistry%20Set - Set goes for ~3 Keys

https://cdn.discordapp.com/attachments/433086365144580107/835274924997607444/63db1cf38a2dbee6648b1aebcd39a0c8.png - Sold for 11 Keys

Sale 3) Sold for ¥ 6500, ~575 tf2 keys

https://imgur.com/a/zWq4fTt

https://imgur.com/a/GbxEiXm - Now for sale for 485 Keys, so this sale will be high

Therefore only usable sale is 350 keys