Resuggestion, thanks to K1ng for the info!

Squad 4, Team No Life!

Mini For PE Eyewear

Squad 4, Team No Life!

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Sale #1 - quicksold for 14 keys 14 ref

https://backpack.tf/profiles/76561198122096342#!/compare/1552521600/1552608000

https://backpack.tf/profiles/76561198083134207#!/compare/1552521600/1552608000

Sale #2 - 14 keys 8.11

https://backpack.tf/profiles/76561198802991149#!/compare/1553299200/1553385600

https://backpack.tf/profiles/76561198256998558#!/compare/1553040000/1553385600

Sale #3 - Sold with 1 key 15 ref for a DBD little buddy

https://backpack.tf/profiles/76561198256998558#!/compare/1553385600/1553472000

https://backpack.tf/profiles/76561198193038015#!/compare/1553385600/1553472000

B/O was 16 keys - https://bot.tf/stats/listings/42KZ7D5Y

Taking 20 - 1.33 = 18.67 keys

Buddy mini - https://backpack.tf/suggestion/5ca2dfc0d3817234622006c4

Sale #4 - 14 keys 18 ref

https://backpack.tf/profiles/76561198193038015#!/compare/1553558400/1553644800

https://backpack.tf/profiles/76561198019257028#!/compare/1553558400/1553644800

Sale #5 - 17 keys

https://backpack.tf/profiles/76561198148511293#!/compare/1549670400/1549756800

https://backpack.tf/profiles/76561198350825059#!/compare/1549670400/1549756800

Sale #6 - Untrace (Nothing really connects)

https://backpack.tf/profiles/76561198350825059#!/compare/1549843200/1550016000

https://backpack.tf/profiles/76561198176781286#!/compare/1549843200/1550016000

Sale #7 - Untrace

https://backpack.tf/profiles/76561198176781286#!/compare/1553040000/1553299200

https://backpack.tf/profiles/76561198867230590#!/compare/1553126400/1553299200

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Taking 14 - 17 keys

K1ng's Part:

I don't see why is 17 being excluded. Aside from that, with 3 sales at ~14 and just one buyer countering this is probably best at 14-17.