Looking at this item: https://backpack.tf/item/8672390014

Sale #1

seller: https://backpack.tf/profiles/76561198073896407#!/compare/1590192000/1590364800

buyer: https://backpack.tf/profiles/76561198036469000#!/compare/1590105600/1590192000

Sold for 25 keys.

The seller then used these 25 keys to buy a It's a puzzle to me Hellmet. That's why there are no keys on seller side.

Why 25 keys and not 24 like buyer side shows?

Hellmet was sold for 25 keys by Bender.

Listings at the time: https://bot.tf/stats/listings/4EPQ776K

https://backpack.tf/profiles/76561198335791307#!/compare/1590192000/1590278400

All the 25 keys trace to buyer except 1. That's why we see only 24 on buyer side.

Sale #2

seller: https://backpack.tf/profiles/76561198036469000#!/compare/1590105600/1590192000

buyer: https://backpack.tf/profiles/76561198205723668#!/compare/1590278400/1590451200

untrace

Sale #3

seller: https://backpack.tf/profiles/76561198205723668#!/compare/1591660800/1591747200

buyer: https://backpack.tf/profiles/76561198113971364#!/compare/1591660800/1591747200

Sold for Collector's Professional Killstreak Machina + 2 keys

Suggested value of the Machina is 23 keys so I'll call it at 25 keys just like sale #1.

Sale #4

seller: https://backpack.tf/profiles/76561198113971364#!/compare/1592006400/1592092800

buyer: https://backpack.tf/profiles/76561198359982620#!/compare/1592006400/1592524800

Sold for Green Energy Backbiter's Billycock = 31 keys.

Aight Scourge, I'll use it 😉

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Looking at this item: https://backpack.tf/item/8313043782

Sale #5

seller: https://backpack.tf/profiles/76561198134220286#!/compare/1591142400/1591228800

buyer: https://backpack.tf/profiles/76561198363395191#!/compare/1591142400/1591228800

untrace

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Looking at this item: https://backpack.tf/item/8179917561

Sale #6

seller: https://backpack.tf/profiles/76561198358891317#!/compare/1588723200/1588896000

buyer: https://backpack.tf/profiles/76561198079609540#!/compare/1589587200/1591142400

bulk

Sale #7

seller: https://backpack.tf/profiles/76561198079609540#!/compare/1591142400/1591574400

buyer: https://backpack.tf/profiles/76561197964546925#!/compare/1592179200/1592265600

Since the item, became non-tradable, it looks like it was a SCM sale: https://steamcommunity.com/market/listings/440/Unusual%20Voodoo%20Vizier

Jun 14, 44.85/2.51 = 18 keys

Might not be that sale tho. Anyway it's way lower than the others.

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Going with 25-31 keys.