Keys priced at 61.56 ref:

https://backpack.tf/suggestion/65319354667a00d2f3098825

Sales for the past 10 days Paypal:

https://forums.backpack.tf/topic/68510-buying-keys-for-174-backpacks-via-paypal-550-trust-ratings✅/page/3/

https://backpack.tf/trust/76561198032176942?page=1&

2340 keys

the priced changed from 1.8 to 1.71 in the past few days, so I will take the most recent value

1.71$

1.71/61.56 = 0.0277~$

round to 0.028$

https://forums.backpack.tf/topic/78481-🔴-buying-🔴-backpacks-🔴-keys-170-🔴-paypal-🔴200-trust-ratings-✅/page/2/

https://backpack.tf/trust/76561198094818081

1.7$

1.7/61.56 = 0.0276~$

round to 0.028$

https://backpack.tf/trust/76561198010382668

1650 keys

1.72$

1.72/61.56 = 0.0279$

round to 0.028$

https://forums.backpack.tf/topic/66758-buying-keys-for-180-usd-via-paypal400-rep/

https://backpack.tf/trust/76561198063345374

895 keys

1.8$

1.8/61.56 = 0.0292~$

round to 0.029$

https://forums.backpack.tf/topic/80968-🦊-buying-keys-🔑-at-165-and-backpacks-with-paypal-and-zelle-400-trust-ratings-✅/

https://backpack.tf/trust/76561199183171982

sales here, but price is unclear, seems like it changed to 1.65 just recently, and it seems too low anyways