Well, probably it isn't that hard.

Basing only off non-duped sales.

"Original price = 1.6 buds"

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Sale #1

http://backpack.tf/profiles/76561198104346765?time=1432105200 before

http://backpack.tf/profiles/76561198104346765?time=1432364400 after

Hey, wtf, where is the unusual??? - It was indirectly traded, anyway these keys were used in ONE trade. And histories match.

To sum up: Indirect trade of 15 keys pure for a pusher - Logical outlier to me for now, bubbling is ~4 keys more

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Sale #2

http://backpack.tf/profiles/76561198010082723?time=1428476043 before

http://backpack.tf/profiles/76561198010082723?time=1428476400 after

Sold for TFLogo Drill (open suggestion at 20 pure) with 2 keys. No overpay as the... mini? for drill is in full pure. 20-2=18

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Sale #3

http://backpack.tf/profiles/76561198106471288?time=1431068400 before

http://backpack.tf/profiles/76561198106471288?time=1431154800 after

Sold for 17 keys pure

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Sale #4

http://backpack.tf/profiles/76561198136556581?time=1430444152 before

http://backpack.tf/profiles/76561198136556581?time=1430463600 after

Sold for MN HWAH, but it's outdated... so guess what? Must... resist... Ignoring.

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Sale #Wtf IsThis

http://backpack.tf/profiles/76561198149177183?time=1430066167 before

http://backpack.tf/profiles/76561198149177183?time=1430204400 after

Sold for spec. ks aussie smg+some things. Outlier even without mini.

~~~~~

Conclusion: That might be a lazy suggestion for someone, but dupes and untrackable\complex things made me give up. 3 sales, one of which is a logical outlier. I'll resuggest myself if i find more sales or apparently 15 won't be too low