Credit to Moose for the help!

Sale 1) Bulk

Seller: https://backpack.tf/profiles/76561197960863138#!/compare/1774224000/1774310400

Buyer: https://backpack.tf/profiles/76561197982127154#!/compare/1774224000/1774310400

Item History: https://backpack.tf/item/4487036016

Sale 2) 2812 Keys

Seller: https://backpack.tf/profiles/76561197982127154#!/compare/1775952000/1776038400

Buyer: https://backpack.tf/profiles/76561199032510824#!/compare/1776038400/1776124800

Item History: https://backpack.tf/item/4487036016

Sale 3) Untrace

Seller: https://backpack.tf/profiles/76561197960268216#!/compare/1769990400/1770681600

Buyer: https://backpack.tf/profiles/76561198850407517#!/compare/1770595200/1770681600

Item History: https://backpack.tf/item/1798484714

Sale 4) Sold for 1986 Keys, Darkblaze Hive Minder (Ongoing price suggestion at 930 keys), and Spooky Night Kazotzky Kick --- 2950 Keys

Seller: https://backpack.tf/profiles/76561198850407517#!/compare/1771632000/1771891200

Buyer: https://backpack.tf/profiles/76561198155066949#!/compare/1771804800/1771891200

Item History: https://backpack.tf/item/1798484714

Mini for Spooky Night Kazotzky Kick

Item History: https://backpack.tf/item/5922430261 - Excluding Marketplace transfer

Sale 1a) Bulk for Arcana Glengarry Bonnet

Seller: https://backpack.tf/profiles/76561198135483308#!/compare/1769472000/1769558400

Buyer: https://backpack.tf/profiles/76561198285371555#!/compare/1769385600/1769558400

Sale 2a) Bulk

Seller: https://backpack.tf/profiles/76561198285371555#!/compare/1771027200/1771286400

Buyer: https://backpack.tf/profiles/76561198155066949#!/compare/1771200000/1771286400

https://next.backpack.tf/classifieds/snapshots/Spooky%20Night%20Taunt:%20Kazotsky%20Kick/69e12d22bdc02a732203928d - B/O 31.5 Keys

Taking Buy orders at 31.5 Keys

1986 + 930 + 31.5 = 2947.5 Keys = ~ 2950 Keys

Item History 3) https://backpack.tf/item/2935218496 - excluding trade backs and mann co transfers

Item History 4) https://backpack.tf/item/2349102102 -duped - neither of these moved, both owners own their pair of antlers.

Taking the range of 2812 - 2950 Keys.