Counter to a pretty lazy suggestion.

Mallard Bucket

#1

(quick)Sold for 14(seller)-16(buyer) keys on SCM 14-16 keys

http://www.tf2outpost.com/trade/28111519 B/O bp price

http://steamcommunity.com/market/listings/440/Unusual%20Brain%20Bucket

https://backpack.tf/item/3268895137

#2

Sold for DP Chieftain's (outdated 25, mini at 20) ~20 keys

http://www.tf2outpost.com/trade/28111173 B/O 22 keys

Buyer: https://backpack.tf/profiles/76561198080693357#!/compare/1461369600/1461628800

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Chieftain

Sold for Spec KS Aussie FaN (14) + 1 bud (2.6) + Dead of Night (2) ~19

https://backpack.tf/profiles/76561198254084066#!/compare/1461628800/1461715200

Sold for Aussie Mini (20)

https://backpack.tf/profiles/76561198254084066#!/compare/1461715200/1461801600

#3

Quicksold for 19 keys

http://www.tf2outpost.com/trade/28111137 B/O 19 keys quicksell

https://backpack.tf/profiles/76561198093983385#!/compare/1461542400/1461628800

#4

Quicksold for 19 keys

Buyer: https://backpack.tf/profiles/76561198093983385#!/compare/1461456000/1461542400

http://www.tf2outpost.com/trade/28108163

Hermes quicksold for 63 keys, he bought bucket with 19 keys, then quicksold it again for 19 keys. Strange.

#5

Sold for Stormy Cowl (outdated 21, mini 21) ~21 keys

Seller: https://backpack.tf/profiles/76561198051515564#!/compare/1460419200/1460505600

Buyer: https://backpack.tf/profiles/76561198044425880#!/compare/1460419200/1460505600

#6

Sold for 20 keys pure

Buyer: https://backpack.tf/profiles/76561198051515564#!/compare/1458864000/1458950400

https://backpack.tf/suggestion/56f7afb2c44045784203ec55 44 of the keys on the Strontium

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Cowl

Sold for C9 Noir (21) + 1 bud (2.5) ~23.5

https://backpack.tf/profiles/76561198044425880#!/compare/1460160000/1460332800

Sold for 18 keys

https://backpack.tf/profiles/76561198049857603#!/compare/1459036800/1459382400

http://www.tf2outpost.com/trade/28111905 duped b/o 18

19 is quicksell. 20-21.