Sale 1:

Sold with some ref for Purple Confetti Batter’s Helmet (Suggestion at 13.5) + 1 key

http://www.tf2outpost.com/trade/29435951 - B/O of 13

Seller: https://backpack.tf/profiles/76561198104012008#!/compare/1510185600/1510358400

Buyer: https://backpack.tf/profiles/76561198275783474#!/compare/1509840000/1510358400

X = 13

Sale 2:

Sold for Kill-a-Watt Sober Stuntman (In-date at 12, sellers at ~9.5, taking 11) + 2 keys

No outpost

Seller: https://backpack.tf/profiles/76561198090147535#!/compare/1507248000/1507334400

Buyer: https://backpack.tf/profiles/76561198308234821#!/compare/1507248000/1507334400

X = 13

Sale 3:

Sold for 12 keys

Seller: https://backpack.tf/profiles/76561198337734785#!/compare/1507680000/1507766400

Buyer: https://backpack.tf/profiles/76561198344429943#!/compare/1507680000/1507766400

X = 12

Sale 4:

Bulk for Vivid Wraith

Seller: https://backpack.tf/profiles/76561198159593026#!/compare/1505865600/1505952000

Buyer: https://backpack.tf/profiles/76561198359449894#!/compare/1505692800/1506038400

Sale 5:

Bulk for Peace Sign Gibus

Seller: https://backpack.tf/profiles/76561198359449894#!/compare/1506038400/1506124800

Buyer: https://backpack.tf/profiles/76561198087172601#!/compare/1506038400/1506124800

Sale 6:

Bulk for Scorching Brotherhood

Seller: https://backpack.tf/profiles/76561198087172601#!/compare/1506124800/1506211200

Buyer: https://backpack.tf/profiles/76561198267189538#!/compare/1506124800/1506211200

Sale 7:

Sold with ~1.5 keys worth for Purple Confetti Stove Pipe

Seller: https://backpack.tf/profiles/76561198088449713#!/compare/1506297600/1506384000

Buyer: https://backpack.tf/profiles/76561198090147535#!/compare/1506297600/1506384000

Should be used on the Stove.

Sale 8:

Sold with ~1 key in items for Peace Sign Brain-Warming Wear

Seller: https://backpack.tf/profiles/76561198109701570#!/compare/1508371200/1508457600

Buyer: https://backpack.tf/profiles/76561198040602196#!/compare/1508371200/1508457600

Can be used on the Brain.

Sale 9:

Sold with at least 2 keys in items for Tesla Coil Katyusha

Seller: https://backpack.tf/profiles/76561198137574728#!/compare/1503878400/1505865600

Buyer: https://backpack.tf/profiles/76561198159593026#!/compare/1505779200/1505865600

Should be used to price the Katyusha.

Sale 10:

Sold for Skill Gotten Gains Spent Well Spirits

Seller: https://backpack.tf/profiles/76561198101623005#!/compare/1510099200/1510358400

Buyer: https://backpack.tf/profiles/76561198104012008#!/compare/1510185600/1510358400

Should be used on the Spirits.

Purple Confetti Batter’s Helm:

https://backpack.tf/suggestion/5a2a611ccf6c75463c49c91c

Sellers:

12 keys:

https://i.imgur.com/1ICesyd.png - 20 days

https://i.imgur.com/ggF372W.png - 11 days

13 keys:

https://i.imgur.com/I6T1IJq.png - 1 day

Sales at:

12

13 (2x)

Going with 12-13.