5 years!

https://backpack.tf/item/6328177712

Sale #1:

https://backpack.tf/profiles/76561198954470051#!/compare/1714089600/1714176000 ~ no mini's on some of the hats :( Lots of hats here

https://backpack.tf/profiles/76561198164814063#!/compare/1714089600/1714176000

Sale #2:

https://backpack.tf/profiles/76561199480240111#!/compare/1711584000/1711670400 ~ Searing Plasma Bedouin Bandana matches

https://backpack.tf/profiles/76561198164814063#!/compare/1711584000/1711670400 ~ Looks like added a Spooky Night Taunt: Scotsmann's Stagger + Cool Professional Killstreak Night Terror Scattergun (Minimal Wear)

Bandana:

https://backpack.tf/suggestion/663c512191ddcfa4ae0ed7de ~ 555

Stagger price is pretty stable, https://i.imgur.com/fMoutex.png ~ buyers at 22.24, sellers at 24.46 so this wont make a difference if we take buyers after rounding.

No mini's for the scatter so can't use this sale anyway.

https://backpack.tf/item/6285643443

Sale #3:

https://backpack.tf/profiles/76561198872222015#!/compare/1711756800/1711843200 ~ 140 keys pure matches

https://backpack.tf/profiles/76561198954470051#!/compare/1711756800/1711843200 ~ bubbling veil + 140 keys

Mini Veil:

https://backpack.tf/suggestion/665971c78b789e0010003fd1 ~ 267.5

= 407.5

Sale #4:

https://backpack.tf/profiles/76561198808344054#!/compare/1711497600/1711584000 ~ 389 keys pure match

https://backpack.tf/profiles/76561198872222015#!/compare/1711497600/1711584000

Sale #5:

https://backpack.tf/profiles/76561199085308746#!/compare/1710288000/1710374400 ~ The Eldritch Opening Vampire Vanquisher + Burning Flames Carouser's Capotain + Condescending Embrace Jolly Jester match

https://backpack.tf/profiles/76561198808344054#!/compare/1710288000/1710374400 ~ also potentially on buyer side the scotsman matches too https://backpack.tf/item/946353093

This seems low, taking sellers for each hat only get 290

Sale #6:

https://backpack.tf/profiles/76561198393217726#!/compare/1709251200/1710288000 ~ ?

https://backpack.tf/profiles/76561199085308746#!/compare/1709164800/1709251200 ~?

Sales @ 389, 407.5