Sale 1:

Sold with ~0.5 in items for Memory Leak Greased Lightning (25.5)

http://www.tf2outpost.com/trade/29515356 - B/O of 28

Seller: https://backpack.tf/profiles/76561198011671663#!/compare/1515715200/1515801600

Buyer: https://backpack.tf/profiles/76561198152011096#!/compare/1515628800/1515801600

X = 25

Sale 2:

Sold with cheap stuff for Green Energy Broadband Bonnet (Mini at 21.5)

Seller: https://backpack.tf/profiles/76561198152011096#!/compare/1515888000/1515974400

Buyer: https://backpack.tf/profiles/76561198225801132#!/compare/1515888000/1516060800

X = 21

Sale 3:

Sold for Miami Nights Stormin' Norman (Suggestion at 17) + cheap items

No outpost

Seller: https://backpack.tf/profiles/76561198335312121#!/compare/1515628800/1515715200

Buyer: https://backpack.tf/profiles/76561198011671663#!/compare/1515628800/1515715200

X = 17

Green Energy Broadband:

https://backpack.tf/suggestion/5a62892e44325a46c65531c4 - Credit to Crimson (refer to my comment on the suggestion)

Miami Stormin:

https://backpack.tf/suggestion/5a70607444325a60e21fd2ef

Sellers:

https://i.imgur.com/5qbmjFy.png

22 keys:

https://backpack.tf/item/6463141477

28 keys:

https://backpack.tf/item/6489687762

Sales at:

17

21

25

Going with 17-25.