Sale 1:

Sold for Smoking Whoopee Cap (Suggestion at 11) + Bubbling Stout Shako (Suggestion at 12)

No outpost

Seller: https://backpack.tf/profiles/76561198202168173#!/compare/1509062400/1509148800

Buyer: https://backpack.tf/profiles/76561198323349846#!/compare/1509062400/1509148800

X = 23

Sale 2:

Sold for Orbiting Fire Hot Dogger (Suggestion at 21) + ~3.5 keys in pure/items

http://www.tf2outpost.com/trade/29380488 - B/O of 20

Seller: https://backpack.tf/profiles/76561197993057065#!/compare/1506816000/1506902400

Buyer: https://backpack.tf/profiles/76561198063707388#!/compare/1506816000/1507766400

X = 20 (Capped by B/O)

Sale 3:

Sold for 16 keys + 5 ref

Seller: https://backpack.tf/profiles/76561198121055881#!/compare/1509494400/1509580800

Buyer: https://backpack.tf/profiles/76561198350044920#!/compare/1509494400/1509580800

X = 16

Sale 4:

Sold for Smoking Blast Defense

Seller: https://backpack.tf/profiles/76561198323349846#!/compare/1509235200/1509321600

Buyer: https://backpack.tf/profiles/76561198275783474#!/compare/1509235200/1509408000

Can be used on the Blast Defense.

Sale 5:

Bulk for Burning Madame Dixie

Seller: https://backpack.tf/profiles/76561198350044920#!/compare/1509840000/1509926400

Buyer: https://backpack.tf/profiles/76561197961172123#!/compare/1509840000/1509926400

Sale 6:

Bulk for Purple Confetti Tough Stuff Muffs

Seller: https://backpack.tf/profiles/76561198193861449#!/compare/1508112000/1508198400

Buyer: https://backpack.tf/profiles/76561198094849912#!/compare/1508112000/1508198400

Sale 7:

Bulk for Slumber Human Cannonball

Seller: https://backpack.tf/profiles/76561198094849912#!/compare/1509062400/1509148800

Buyer: https://backpack.tf/profiles/76561198202168173#!/compare/1509062400/1509148800

Smoking Whoopee:

https://backpack.tf/suggestion/5a2a64d344325a5d57797ef1

Bubbling Stout Shako:

https://backpack.tf/suggestion/5a2a6e1fcf6c754f8035eeee

Sellers:

23 keys:

https://i.imgur.com/w424b4H.png - 2 months

https://i.imgur.com/jIo0IOs.png - 1 month

Sales at:

16

20

23

Buyer at 16:

https://i.imgur.com/5BzlzFZ.png - excluding 16.

Going with 20-23.