Only (duplicated ?) sale recorded :

Roboactive Bone Dome :

Initial Sale :

- Seller : https://backpack.tf/profiles/76561198828324385#!/compare/1658361600/1658448000

- Buyer : https://backpack.tf/profiles/76561198064428858#!/compare/1658102400/1658448000

History : https://backpack.tf/item/3641996538

https://next.backpack.tf/item/3641996538

Imgur link : https://imgur.com/a/g50bjcQ

Sales of the items involved in the trade :

1) Scorching Flames Neckwear Headwear :

- Seller : https://backpack.tf/profiles/76561198828324385#!/compare/1659484800/1659744000

- Buyer : https://backpack.tf/profiles/76561198133002443#!/compare/1659225600/1659916800

History : https://backpack.tf/item/11723109395

Sold for 136 keys

2) Terror-Watt Head Warmer : https://imgur.com/a/VXyUxHz

History : https://backpack.tf/item/11750046282

Sold for 20 keys + 73.11 ref total

3) Green Giggler Handsome Handy Thing : https://imgur.com/a/49W7hE8

History : https://backpack.tf/item/9421763264

Sold for 15 keys

4) Purple Confetti Noble Amassment of Hats : https://imgur.com/a/vW6iVre

History : https://backpack.tf/item/11835337906

Sold for 9 keys + 27.88 ref total

5) Massed Flies Metal Slug : https://imgur.com/a/APUIoM4

Price of the Battle-Worn Robot Taunt Processor around the time of the sale : https://backpack.tf/suggestion/62c60053199dfd3eae0f940c

1.22-1.33 ref

Price of the Battle-Worn Robot KB-808 around the time of the sale : https://backpack.tf/suggestion/62e2cf3f5b9ca023ba0f639b

1.22-1.33 ref

History : https://backpack.tf/item/11807409500

Sold for 7 keys + 43.77-44.11 ref total

Key prices around the time of all sales involved :

-Most recent : https://backpack.tf/suggestion/62eea13be0f96051490b5ae1

56.88-57 ref

-Least recent : https://backpack.tf/suggestion/62dfe8e66e091d888800e6aa

58.66-58.77 ref

Total of the items involved in the Roboactive Bone Dome sale sold in keys and refined :

1) Keys : 27 initial keys + 136 + 20 + 15 + 9 + 7 = 214 keys

2) Refined converted into keys :

73.11 + 27.88 + 43.77-44.11 = 144.77-145.11 ref -> 144.77/58.77 ≈ 2.46 keys

-> 145.11/56.88 ≈ 2.55 keys

3) Total : 214 + 2.46-2.55 ≈ 216.46-216.55 keys

Rounding that to 217 keys