I believe one sale is not enough for a suggestion here. There are more trades you could present here like this one on mp.tf (should still be in date) https://marketplace.tf/items/tf2/31041;5;u13 for ~55

As mentioned, that sale is 40 Keys, not 44. There are also additional sales:

https://backpack.tf/profiles/76561198353309101#!/compare/1573084800/1573171200 - All 4 of these will need to be updated first

https://backpack.tf/profiles/76561198227757008#!/compare/1573344000/1573516800 - 99% certain this sale was $92 on SCM

https://steamcommunity.com/market/listings/440/Unusual%20Melted%20Mop

https://backpack.tf/profiles/76561198132226518#!/compare/1574208000/1574294400 - Sold with 3 other Unusuals for this Peak

https://backpack.tf/profiles/76561198124222069#!/compare/1574208000/1574294400 - Here are the 3 other Unusuals

https://backpack.tf/profiles/76561198124222069#!/compare/1574726400/1574899200 - 36 Keys to a buy order

https://marketplace.tf/items/tf2/31041;5;u13

The Marketplace sale came from this history https://backpack.tf/item/8044996369 (no buyout to be found)

The first sale will likely be too high, given the current Seller at 50 Keys. Wait and see what happens to the Seller before fixing this.

there can only be threeeeee?

you will never reach the truth