Choo Choo. Car 14.

Sale 1:

https://backpack.tf/profiles/76561198067161406#!/compare/1532044800/1532390400

https://backpack.tf/profiles/76561198199264815#!/compare/1532044800/1532131200

Sold for 23 keys

http://www.tf2outpost.com/trade/29659241

B/O of 20, capping.

Sale 2:

https://backpack.tf/profiles/76561198161364079#!/compare/1532044800/1532736000

https://backpack.tf/profiles/76561198003404879#!/compare/1532044800/1532131200

Untrace.

Sale 3:

https://backpack.tf/profiles/76561198003404879#!/compare/1532217600/1532304000

https://backpack.tf/profiles/76561198032176942#!/compare/1532217600/1532304000

Sold for 16 keys + ~1 key in ref

Total is 17 keys

http://www.tf2outpost.com/trade/29718596

B/O of 18 keys

Sale 4:

https://backpack.tf/profiles/76561198021055079#!/compare/1530748800/1530835200

https://backpack.tf/profiles/76561198153360103#!/compare/1530662400/1530835200

Sold for 21 keys

Sale 5:

https://backpack.tf/profiles/76561198292750935#!/compare/1531699200/1531872000

Untrace.

Sale 6:

https://backpack.tf/profiles/76561198296642837#!/compare/1531526400/1531872000

https://backpack.tf/profiles/76561198277477976#!/compare/1531785600/1531872000

Sold for Blizzardy Tyrannus

Tyrannus Mini:

https://backpack.tf/suggestion/5b7200dd44325a1b59586394

Suggestion for 13.5 keys

Sale 7:

https://backpack.tf/profiles/76561198277477976#!/compare/1532044800/1532217600

https://backpack.tf/profiles/76561197975587947#!/compare/1532131200/1532217600

Sold for 17 keys + negligible ref

http://www.tf2outpost.com/trade/29717689

B/O of 18 keys.

Sale 8:

https://backpack.tf/profiles/76561197975587947#!/compare/1533340800/1533427200

https://backpack.tf/profiles/76561198067741299#!/compare/1533340800/1533427200

Sold with 6 keys for HG Elfin Deal

Use there.

Sale 9:

https://backpack.tf/profiles/76561198067741299#!/compare/1533600000/1533772800

https://backpack.tf/profiles/76561198819934412#!/compare/1533513600/1533772800

Sold for Vivid Mongolian(12) + 6 keys + ~1 key in sweets

Total is 19 keys

Sale 10:

https://backpack.tf/profiles/76561198819934412#!/compare/1533772800/1533859200

https://backpack.tf/profiles/76561198043982289#!/compare/1533772800/1533859200

Sold for Bubbling Tundra Top + ~1 key in sweets

Tundra Mini:

https://backpack.tf/suggestion/5b7324b9cf6c750c3b03fd37

Suggestion for 14.5 keys

Total is 15.5 keys

Sale 11:

https://backpack.tf/profiles/76561198322303633#!/compare/1534032000/1534118400

Sold for CTFL Beanie(17) + 1 key

Total is 18 keys

https://i.imgur.com/OHCcIP2.png

B/O of 18 keys

Total sales @:

13.5, 15.5, 17, 17, 18, 19, 20 ,21

https://i.imgur.com/Ma6s41g.png

Buyers up to 15.

Considering recent B/O of 18 and sold within 2 days,

Taking 17 - 21 keys.