Sellers:

http://imgur.com/a/M75iZ

https://backpack.tf/item/2482782275 - b/o: 22 keys

Classifieds: https://backpack.tf/classifieds?item=Runner%27s%20Warm-Up&quality=5&tradable=1&craftable=1&australium=-1&particle=60

Screenshot(s) of Classifieds:

http://imgur.com/bcEogvW

<Sellers>

26 keys | http://backpack.tf/item/2646044486 | http://backpack.tf/u/76561198119563409 | Listed 3 days ago [Bumped]

28 keys | http://backpack.tf/item/5619856016 | http://backpack.tf/u/76561198011321852 | Listed 12 days ago [Bumped]

http://www.tf2outpost.com/trade/28782918 - b/o: 24 keys (1 month)

http://www.tf2outpost.com/trade/28807901 - b/o: 19 keys (1 month)

Sold:

https://backpack.tf/profiles/76561198202032292#!/compare/1490659200/1490745600 - sold for Phosphorous Madame Dixie = ?

http://www.tf2outpost.com/trade/28849065

https://backpack.tf/profiles/76561198202032292#!/compare/1490486400/1490572800 - sold for Blizzardy Storm Runner's Warm-Up = 27 keys (outlier)

https://backpack.tf/profiles/76561198181340953#!/compare/1490486400/1490572800 - sold for Neutron Star Airdog = 19 keys

Mini's:

Phosphorous Madame Dixie:

no mini

Blizzardy Storm Runner's Warm-Up:

https://backpack.tf/profiles/76561198267302142#!/compare/1491350400/1491436800 - sold for Cloud 9 Outta' Sight = 38 keys (buyer re-selling for 27 keys, capping at that)

http://www.tf2outpost.com/trade/28862016 - b/o: 27 keys (3 days)

Neutron Star Airdog:

http://www.tf2outpost.com/trade/28845894

https://backpack.tf/profiles/76561198168625615#!/compare/1490400000/1490486400 - sold for Dead Presidents Ze Goggles + 3 keys = 19 keys