There are lots more sales that need to be considered:

https://backpack.tf/item/11270363478

https://backpack.tf/item/10578538920

https://backpack.tf/item/9060791931

https://backpack.tf/item/8291989263

https://backpack.tf/item/8290765993

https://backpack.tf/item/8265445183

https://backpack.tf/item/8174551989

https://backpack.tf/item/8162091589

Also, you need to trace the 10 key sale through compares for it to be valid (stats alone isn't enough since it could have been negotiated for less or items could have been used instead of full pure)

One other thing is the Marketplace.tf sales are all outdated since they're over 3 months old, therefore they can't be used

this is insufficient evidence for an unusual suggestion. i recommend going through the unusual suggestion guideline to get a better understanding of what sort of proof is required for these type of suggestions: https://forums.backpack.tf/topic/6033-rules-for-unusual-price-suggestions/