Only one recent sale.

Sold for a Gifted Orbiting Fire Brown Bomber after adding a Professional Killstreak Rescue Ranger and Professional Killstreak Jag:

http://www.tf2outpost.com/trade/23590082

The weapons:

http://www.tf2outpost.com/trade/23588019

The Bomber:

http://www.tf2outpost.com/trade/23670455

Mini Suggestion on the Gifted Orbiting Fire Brown Bomber:

Appears to have sold for 41 keys pure:

http://www.tf2outpost.com/trade/23484029

Earbuds were 15.5 keys at that time

Rounding it to 2.6 buds

Mini suggestion for the Professional Killstreak weapons:

The Rescue Ranger:

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Rescue%20Ranger

Taking it as 5 keys

The Jag:

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Jag

Taking it as 9 keys

Total: 9 + 5 = 14 keys

14*0.9 = 12.6 keys

Earbuds were 14.75 keys at that time

12.6 keys = ~0.9 buds

2.6 - 0.9 = 1.7