https://backpack.tf/rules

"Our price moderators have no access to Mannco anymore, and along with the recent changes that do not allow the viewing of their sales graphs without logging in, we are no longer able to verify Mannco sales. Unfortunately, that means we can no longer allow trades that occur on Mannco for price suggestions."

Also more sales you need to check:

https://backpack.tf/item/14524301085

https://backpack.tf/item/14454999102

https://backpack.tf/item/13178263559

https://backpack.tf/item/12614161819

https://backpack.tf/item/12476334039

https://backpack.tf/item/12408559870

https://stntrading.eu/item/tf2/Unusual+Cosmic+Constellations+Plaid+Lad

https://imgur.com/JT07hvi

1 seller @ 50 keys unsold, these trades are clearly outliers

For more informatios:

https://forums.backpack.tf/topic/79020-guide-how-to-make-an-unusual-price-suggestion-2021-edition/

2 sellers in classies at 50 keys. this is going to be high