Using last month.

Sale 1:

Sold for 11 keys

Seller: https://backpack.tf/profiles/76561198305676157#!/compare/1525564800/1525651200

Buyer: https://backpack.tf/profiles/76561198027354784#!/compare/1525478400/1525651200

Bot.tf confirms: https://i.imgur.com/uPIUXTH.png

X = 11

Sale 2:

Sold for Showstopper Headcase + Skill Gotten Gains Skullcracker

https://i.imgur.com/uPIUXTH.png - B/O of 11, according to bot.tf

Seller: https://backpack.tf/profiles/76561198305676157#!/compare/1527292800/1527379200

Buyer: https://backpack.tf/profiles/76561198142343332#!/compare/1527206400/1527379200

Both taunts are in-date, and should still retain most of its value, at least enough for it to cap.

X = 11 (Capped by B/O)

Sale 3:

Sold to a bot for 9 keys + 3 ref

Seller: https://backpack.tf/profiles/76561198178088350#!/compare/1525392000/1525478400

Buyer: https://backpack.tf/profiles/76561198305676157#!/compare/1525392000/1525478400

Bot.tf confirms: https://i.imgur.com/uPIUXTH.png

X = 9

Sale 4:

Sold to a bot for 9 keys + 3 ref

Seller: https://backpack.tf/profiles/76561198027354784#!/compare/1527379200/1527465600

Buyer: https://backpack.tf/profiles/76561198305676157#!/compare/1527292800/1527379200

Bot.tf confirms: https://i.imgur.com/uPIUXTH.png

X = 9

Sale 5:

Sold for 10 keys?

Seller: https://backpack.tf/profiles/76561197972126182#!/compare/1527033600/1527465600

Buyer: https://backpack.tf/profiles/76561198009832585#!/compare/1525651200/1527465600

Not too sure about this sale. The seller’s backpack wasn’t scanned until I looked at it.

Sellers:

32 keys:

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

https://backpack.tf/item/6628182563

Sales at:

9 (2x)

11 (2x)

9 looks low, excluding 9.

Going with 11 flat.

Looks like we might have a price on every '72 taunt: https://backpack.tf/effect/%2772