Party Animal

http://backpack.tf/item/5236936207

Sale 1) Sold for a Miami Nights Tyrant's Helm (32 Keys) + Strange Killstreak Huntsman (~4 Keys)

http://backpack.tf/profiles/76561198150783829#!/compare/1480723200/1480809600

32 + 4 = 36 Keys

Tyrant's Mini

http://backpack.tf/profiles/76561198066195760#!/compare/1486598400/1486684800 - Sold for a Professional Killstreak Australium Eyelander (~32 Keys)

Sale 2) Sold for a Professional Killstreak Australium Ambassador (~19 Keys) + ~6 Keys of Items

http://backpack.tf/profiles/76561198123450232#!/compare/1481155200/1481241600

19 + 6 = 25 Keys

http://backpack.tf/item/5021827497

Sale 3) Sold for a Stormy 13th Hour Dread Knot (34 Keys)

http://backpack.tf/profiles/76561198120797495#!/compare/1487721600/1487808000

http://backpack.tf/item/4953803507

Sale 4) Quicksold for 50 Keys

http://backpack.tf/profiles/76561198059042690#!/compare/1482278400/1482364800

http://backpack.tf/item/4957620610

Sale 5) Sold for 20 Keys

http://backpack.tf/profiles/76561198040434720#!/compare/1484697600/1484784000

http://www.tf2outpost.com/trade/28706158 - Took a week

Sale 6) Sold for a Fresh Brewed Victory Unusualifier (40 Keys)

http://backpack.tf/profiles/76561198011321852#!/compare/1484784000/1484870400

Unusualifier Mini

http://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20Fresh%20Brewed%20Victory%20Unusualifier

Using the 2 sales from 1/18 ($101.05) and 1/21 ($101.11), since the sale happened 1/20. Both sales are roughly 40 Keys.

Even the most recent sale ($95.11) is 38 Keys, which can round to 40 Keys.

Calling 20 low and 40 and 50 high.

http://www.tf2outpost.com/trade/28765533 - Seller at 25 Keys