So. Many. Histories.

Sold for 20 Keys

http://backpack.tf/profiles/76561198094734531#!/compare/1462665600/1463011200

Sold for 16 Keys

http://backpack.tf/profiles/76561198139417842#!/compare/1467331200/1467417600

Sold for 17 Keys(2 Keys were in metal)

http://backpack.tf/profiles/76561198083465811#!/compare/1467417600/1467504000

Sold for 18 Keys(1 Key was in metal)

http://backpack.tf/profiles/76561198118126742#!/compare/1467763200/1467849600

Sold for 17 Keys

http://backpack.tf/profiles/76561198095557579#!/compare/1468627200/1468713600

Sold for 21 Keys(Item IDs match)

http://backpack.tf/profiles/76561197998939874#!/compare/1464480000/1464825600

Sold for an Energy Orb Low Profile SMG(Well-Worn)(14 Keys) and ~11 Keys in Sweets(25 Keys total, Outlier)

http://backpack.tf/profiles/76561198173778241#!/compare/1465171200/1465257600

Sold for an Orbiting Planets Armored Authority(21 Keys)

http://backpack.tf/profiles/76561197998939874#!/compare/1465689600/1465776000

http://backpack.tf/item/4252372360

Sold for 16 Keys

http://backpack.tf/profiles/76561198081243492#!/compare/1468022400/1468108800

Sold for 19 Keys

http://backpack.tf/profiles/76561198176125115#!/compare/1461715200/1461801600

Sold with ~4 Keys in Sweets for a Blizzardy Storm Tartan Spartan(21 Keys)(17 Keys total)

http://backpack.tf/profiles/76561198246988440#!/compare/1467417600/1467504000

Sold for ~13 Keys in Items, Outlier

http://backpack.tf/profiles/76561198257395403#!/compare/1464307200/1464393600

Sold for an Australium Grenade Launcher(20 Keys at the time)

http://backpack.tf/profiles/76561198087914032#!/compare/1464652800/1464825600

Sold for 17 Keys

http://backpack.tf/profiles/76561198048851745#!/compare/1465257600/1465344000

Sold for a Disco Beat Down Katyusha(15.5 Keys), an Australium Frontier Justice(10 Keys) and 1.5 Keys(27 Keys total)(B/O was 19)

http://backpack.tf/profiles/76561198109191256#!/compare/1465257600/1465344000

http://www.tf2outpost.com/trade/28240542

25 is obviously too high, the rest of the sales seem to fit. 16-21 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.