After going through only 7 pages of this item, and more than half of those 7 pages the luger is being sold in a vintage weapon set, scout set, is community sparkle, or is being sold for cash i found these links

http://www.tf2outpost.com/trade/7606850 - Turned down multiple 10 key offers and turned down a 10.5 key offer

http://www.tf2outpost.com/trade/8915769 - turned down 10 key offer, CS bills + key + sweets offer (10 keys + sweets)

http://www.tf2outpost.com/trade/8616775 - Turned down black bills + 2 key offer (12 keys)

http://www.tf2outpost.com/trade/8956340 - Turned down a Gold MK. 2 Wrench + key offer (10 keys)

http://www.tf2outpost.com/trade/8498899 - turned down 10 key offer

http://www.tf2outpost.com/trade/8892786 - Had an add at 11 keys (but the person already bought at 11 keys elsewhere), Turned down white bills offer, turned down 10 key offer

http://www.tf2outpost.com/trade/8756353 - Has 11 key offer, white bills + key offer, turned down 10 key offer, Pink bills + 3 keys offer (12 keys), turned down a second white bills + key offer

http://www.tf2outpost.com/trade/8957117 - White bills + genuine bouffant offer (10.5-12 key offer depending how you value the items)

http://www.tf2outpost.com/trade/7979894 - turned down multiple 10 key offers, multiple white bills offers, a clean spine chilling skull painted purple (12.5-13 keys)

http://www.tf2outpost.com/trade/8786794 - turned down 10 keys, white bills

http://www.tf2outpost.com/trade/8938327 - turned down TS EA + 14 ref (10.5 keys)

http://www.tf2outpost.com/trade/8554108 - 10.5 key offer

http://www.tf2outpost.com/trade/8506822 - Only Trade on outpost selling for 10 keys but i don't think this is a series offer cause tons of people have added him for 10 keys in the past 2 weeks and its still up

http://www.tf2outpost.com/trade/8877499 - turned down 10 key offer

http://www.tf2outpost.com/trade/8950400 - turned down 10 key offer

http://www.tf2outpost.com/trade/8927670 - turned down white bills offer

There are also a lot of links of people buying at 8-10 keys failing, so let me know if you want to see any of those.

So as you can see all 10 keys offers are turned down and there or other offers offers ranging from 1.5 keys up to 13 keys in items.