Resuggestion from https://backpack.tf/suggestion/6007009e7d4fb60cf658ac5d#comment-602165f8ee47a224c85feec7

Many thanks to aj and K1ng

History 1: https://backpack.tf/item/7966324229

16 keys pure + Robo Community Crate Key + Bruiser's Bandanna with Tinge paint

https://backpack.tf/profiles/76561198095022965#!/compare/1608249600/1608336000

https://backpack.tf/profiles/76561198168563614#!/compare/1608249600/1608336000

Robo Key doesn't have any recent pure sales to taking 1 key for it given that's the current price and buyers are at that too

For the Bandanna, taking 23 ref since there are multiple buyers at 23 for that specific paint and not too far off from a seller at 30 ref https://imgur.com/dKZPg7W

Keys were 60.33-60.44 ref https://imgur.com/CrIXBbP, 23/60.38=0.38 keys

16+1+0.38=17.38 ~17 keys

buyout was 18 keys, doesn't cap https://gladiator.tf/listings/5fdbb6af9bb6e58c5d55c043

Untraceable Marketplace.tf sale: https://marketplace.tf/items/tf2/30314;5;u35

December 13: $35/1.92=18.23 ~18 keys

From Aj:

Item 1

https://backpack.tf/item/3362425735

Sale 1

https://backpack.tf/profiles/76561197960988736#!/compare/1611187200/1611619200

https://backpack.tf/profiles/76561198098096360#!/compare/1611446400/1611532800

Sold for 14 keys

Sale 2

https://backpack.tf/profiles/76561198098096360#!/compare/1611446400/1611532800

https://backpack.tf/profiles/76561198261763109#!/compare/1611446400/1611532800

It would appear to have sold for

Green Confetti King Cardbeard

3 keys (using there)

Sale 3

https://backpack.tf/profiles/76561198261763109#!/compare/1611532800/1611619200

https://backpack.tf/profiles/76561198196410274#!/compare/1611532800/1611619200

Untrace

Sale 4

https://backpack.tf/profiles/76561198196410274#!/compare/1611619200/1611705600

https://backpack.tf/profiles/76561198951078366#!/compare/1611619200/1611705600

Untrace

Sale 5

https://backpack.tf/profiles/76561198951078366#!/compare/1611705600/1611792000

https://backpack.tf/profiles/76561198140316312#!/compare/1611705600/1611792000

Sold for Circling Peace Sign Your Worst Nightmare (using there)

From K1ng:

14 took ~4 days and buyers were under 13 at the time. I would go with 14-17 here and use this to update both Cardbeard and YWN, as these sales will either fall in range or be above unsolds.