Thanks to Lemon:

I just bought one for £29.04 https://gyazo.com/3feee8cab63952e4f9b3648486f681cd / £1.58 https://gyazo.com/1d1ca2ce39128db41dc58843ad938bef

= 18 keys.

Credit to Xergoyf for the following:

https://gladiator.tf/listings/61362ca37dbc6efd2037af5f

https://gladiator.tf/listings/61365561c1ffca027e4f3ec7

https://backpack.tf/profiles/76561199099521803#!/compare/1630886400/1630972800

Kinda support that the Conga + Deck were sold for 52 total (21 for it), off by 1 key by my count.

https://gladiator.tf/sales?item=Delightful%20Star%20Taunt:%20The%20Pooped%20Deck&at=2021-09-13T04:59:21.643Z also a 21 glad buy

18-21 seems plausible here :D

https://backpack.tf/item/9570148759

https://backpack.tf/profiles/76561198142584166#!/compare/1630713600/1630972800

some keys match, rest was prob used to buy aussie tomislav, snapshot suggests sale for ~21k buy order https://gladiator.tf/listings/6132df5580c01f467266828e

(this also looks like a dump by the same user after buying)

https://backpack.tf/item/9567673405

https://backpack.tf/profiles/76561198061398890#!/compare/1630627200/1631404800

https://gladiator.tf/sales?item=Delightful%20Star%20Taunt:%20The%20Pooped%20Deck&at=2021-10-22T00:26:07.336Z

~15k buy order

https://backpack.tf/profiles/76561199099031605#!/compare/1634083200/1634169600

https://gladiator.tf/sales?item=Delightful%20Star%20Taunt:%20The%20Pooped%20Deck&at=2021-10-22T00:26:07.336Z

30k sale

https://marketplace.tf/items/tf2/31153;5;u3049

~37k sale on Oct 10 is too high given 30k seller on classies

18-21 as per Lemon's comments.