Resuggesting cause I did a proper mini/suggestion for one and it changed the range a whole bunch.

Sale 1

Sold/offered with 4 keys for terror-watt thirst blood = 27 - 4 = 23 keys

Seller before: http://backpack.tf/profiles/76561198053631638?time=1429513200 (April 20th)

Seller after: http://backpack.tf/profiles/76561198053631638?time=1429599600 (April 21st)

Sale 2

Sold for overclocked bloke's bucket hat (23) = 23 * 0.9 = 21 keys

Seller before: http://backpack.tf/profiles/76561198090457223?time=1429340400 (April 18th)

Seller after: http://backpack.tf/profiles/76561198090457223?time=1429426800 (April 19th)

Sale 3

Sold for c9 respectless robo glove (23-25) = 24 * 0.9 = 22 keys

Seller before: http://backpack.tf/profiles/76561198061890230?time=1429081200 (April 15th)

Seller after: http://backpack.tf/profiles/76561198061890230?time=1429167600 (April 16th)

Sale 4

Sold/offered with 0.5 key sweets for purple fetti hottie's hoodie (15-20) and 2 keys = (17.5 + 2) - 0.5 = 19 keys

Seller before: http://backpack.tf/profiles/76561198101329220?time=1425715200 (March 7th)

Seller after: http://backpack.tf/profiles/76561198101329220?time=1425801600 (March 8th)

Sale 5

Sold for ghastly ghosts jr bot dogger (33) = 33 * 0.9 = 30 keys

Buyer before: http://backpack.tf/profiles/76561198101329220?time=1425628800 (March 6th)

Buyer after: http://backpack.tf/profiles/76561198101329220?time=1425715200 (March 7th)

Mini for terror watt thirst blood:

Sold for 27 keys pure

Seller before: http://backpack.tf/profiles/76561198079817842?time=1429340400 (April 18th)

Seller after: http://backpack.tf/profiles/76561198079817842?time=1429426800 (April 19th)

Mini for overclocked bloke's bucket hat:

Sold for dbd conquistador (26) = 26 * 0.9 = 23 keys

Seller before: http://backpack.tf/profiles/76561198126060470?time=1428476400 (April 8th)

Seller after: http://backpack.tf/profiles/76561198126060470?time=1428562800 (April 9th)

Mini on c9 robo glove:

http://backpack.tf/vote/id/55377829ba8d88393b8b53e3 - 23-25 keys

Buyer before: http://backpack.tf/profiles/76561198097169690?time=1429426800 (April 19th)

Buyer after: http://backpack.tf/profiles/76561198097169690?time=1429599600 (April 21st)

Mini for ghosts jr bot dogger:

Sold for aces bolted birdcage (12), miami capo's capper (23) and ~2 keys in sweets = (12 + 23 + 2) * 0.9 = 33 keys

Buyer before: http://backpack.tf/profiles/76561198101329220?time=1425024000 (February 27th)

Buyer after: http://backpack.tf/profiles/76561198101329220?time=1425110400 (February 28th)

Micro for miami capo's capper:

Sold for c9 capo's capper but BO was 23 keys

http://www.tf2outpost.com/trade/25288272

Buyer before: http://backpack.tf/profiles/76561198136332670?time=1425542400 (March 5th)

Buyer after: http://backpack.tf/profiles/76561198136332670?time=1425628800 (March 6th)

With 4 sales close together, 30 seems like the clear outlier, so leaving it out of the range. Any feedback is appreciated.