Time for a small drop.

Classifieds at time of posting: http://backpack.tf/classifieds/?item=Machina&quality=11&tradable=1&craftable=1

1x 15.9 keys

5x 16 keys

1x 1 bud (~16.8 keys)

10x 17 keys

Sellers below 17 keys

15 keys

http://www.tf2outpost.com/trade/23094617 - Young

15.9 keys

http://www.tf2outpost.com/trade/23087428 - Young (Two parts)

16 keys

http://www.tf2outpost.com/trade/23038105 - 3 days

http://www.tf2outpost.com/trade/23039674 - 3 days

http://www.tf2outpost.com/trade/23094907 - Young

http://www.tf2outpost.com/trade/23060649 - 2 days

http://www.tf2outpost.com/trade/23056279 - 2 days

http://www.tf2outpost.com/trade/23054576 - 1 day

http://www.tf2outpost.com/trade/23009679 - 5 days

16.5 keys

http://www.tf2outpost.com/trade/23071415 - 1 day (Headshot + 2 parts)

1 bud (~16.8 keys)

http://www.tf2outpost.com/trade/23062882 - 2 days (Headshot)

http://www.tf2outpost.com/trade/23060115 - 2 days (Killstreak) + (Headshot + 1 part)

http://www.tf2outpost.com/trade/23080372 - Young

http://www.tf2outpost.com/trade/22931905 - 1 week (Spec Killstreak) + (Headshot)

http://www.tf2outpost.com/trade/22851458 - 2 weeks

http://www.tf2outpost.com/trade/21987227 - 1 month (Spec Killstreak) + (Headshot)

Unsold at 17 keys

http://www.tf2outpost.com/trade/23053979 - 2 days (1 part)

http://www.tf2outpost.com/trade/23042341 - 3 days (1 part)

http://www.tf2outpost.com/trade/22918821 - 1 week (Headshot + 2 parts)

http://www.tf2outpost.com/trade/23082033 - 1 day (Spec killstreak)

http://www.tf2outpost.com/trade/23051675 - 2 days

http://www.tf2outpost.com/trade/23096407 - Young

http://www.tf2outpost.com/trade/22883819 - 1 week (Headshot + 2 parts)

http://www.tf2outpost.com/trade/23075845 - 1 day (Spec killstreak)

http://www.tf2outpost.com/trade/23092748 - Young

http://www.tf2outpost.com/trade/23035810 - 4 days (Headshot)

http://www.tf2outpost.com/trade/22981710 - 1 week (3 parts)

http://www.tf2outpost.com/trade/23084079 - 1 day (Spec killstreak)

http://www.tf2outpost.com/trade/22913522 - 1 week (1 part)

http://www.tf2outpost.com/trade/22890356 - 1 week

Solds (Hard to find)

http://www.tf2outpost.com/trade/23071167 - 15 keys

http://gyazo.com/73f0090b565c4033d0f2326f1784cc38 - 16.8 keys (Spec killstreak)

http://www.tf2outpost.com/trade/23019341 - 17 keys (Not in bp)

http://www.tf2outpost.com/trade/23018511 - 16.8 keys (Sold to him^)

http://www.tf2outpost.com/trade/23016310 - 16.8 keys (Sold to him^)

http://gyazo.com/d0f980a0d4ef982dcd9b7ba3802b3669 - JESUS 17 keys for pro (Buds were 17 at the time)

In conclusion, from above it seems 17 is still possible but definitely need to add 16 to the range.

Peace out,

Kombat Wombat.