Sale 1:

Sold for Aces High Galvanized Gibus (In-date at 31, aged seller at 25, taking midpoint (28))+ 6 keys

No outpost

Seller: https://backpack.tf/profiles/76561198089253101#!/compare/1499904000/1501027200

Buyer: https://backpack.tf/profiles/76561198207702035#!/compare/1500940800/1502064000

X = 34

Sale 2:

Sold for $65.98 on Marketplace.tf

https://marketplace.tf/items/30003;5;u36

https://backpack.tf/item/5679724075

65.98/2.05 = ~32.1

X = 32

Sale 3:

Sold for Aces High Hot Dogger + ~1 key in items + possibly the nuts triboniophorus?

Seller: https://backpack.tf/profiles/76561198058248287#!/compare/1498694400/1499558400

Buyer: https://backpack.tf/profiles/76561198089253101#!/compare/1498780800/1498867200

Can't tell if the Trib was involved or not. Excluding this sale.

Sale 4:

Bulk for things

Seller: https://backpack.tf/profiles/76561198079110722#!/compare/1499385600/1499472000

Buyer: https://backpack.tf/profiles/76561198124069244#!/compare/1499385600/1499472000

Sales at:

32

34

No current sellers (one on outpost already sold)

Going with 32-34.