PROBE

https://backpack.tf/item/4475587596

Sale 1) Sold for a Duped Haunted Ghosts A Rather Festive Tree

https://backpack.tf/profiles/76561198179707937#!/compare/1511654400/1511740800

Fits in the range.

Tree Mini

https://backpack.tf/profiles/76561198167854393#!/compare/1508112000/1508198400 - Sold for a DBD Metal Modest (45 Keys)

http://www.tf2outpost.com/trade/29399587 - Capped by the Buyout of 43 Keys

Not counting Duped over Clean, so I'll use this Clean seller at 32 Keys ---> https://imgur.com/a/aVDok

https://backpack.tf/item/4224660821

Sale 2) Sold for a '72 Balloonibouncer + Blizzardy Storm Hustler's Hallmark

https://backpack.tf/profiles/76561198179707937#!/compare/1510617600/1510704000

High and this is a taunt sale.

Sale 3) Sold for 24 Keys

https://backpack.tf/profiles/76561198246427928#!/compare/1512432000/1512604800

https://backpack.tf/item/6311032387

Sale 4) Sold for a Duped Smoking Team Captain (34 Keys)

https://backpack.tf/profiles/76561198192602363#!/compare/1511222400/1511308800

Team Captain Mini

https://backpack.tf/profiles/76561198061676206#!/compare/1511049600/1511136000 - Sold for a Duped Stormy Storm Killer Exclusive

https://backpack.tf/profiles/76561198053747026#!/compare/1510012800/1510099200 - Sold for an Orbiting Fire Fortunate Son + 14 Keys

https://backpack.tf/suggestion/5a2d663e44325a50cd6c7c70 - Not counting Duped over Clean, so I'll use this Clean suggestion at 34 Keys.

https://backpack.tf/item/4254392729

Sale 5) Sold + ~1 Key of Items for a Stormy Storm Dr's Dapper Topper (34 Keys)

https://backpack.tf/profiles/76561198097454374#!/compare/1512691200/1512777600

34 - 1 = 33 Keys

Sale 6) Sold for 25 Keys

https://backpack.tf/profiles/76561198059078220#!/compare/1512691200/1512864000

This sale took 2 or so days, so I'll call 24 Keys low.

https://imgur.com/a/Vxoyl - 3 Day Seller at 28 Keys, 7 Day Seller at 29 Keys, Young Seller at 29 Keys, 13 Day Seller at 30 Keys, and a 5 Day Seller at 35 Keys.

I'm using the Sellers and the 24 Key sale to support 25 Keys being in the range.