4 in existance:

http://backpack.tf/item/1980237594

http://backpack.tf/item/1490401566

http://backpack.tf/item/804455211

http://backpack.tf/item/716401237

Only 1 recent sale (the other is nearly 6 months ago):

backpack before: http://backpack.tf/profiles/76561198032605488?time=1418544000

backpack after: http://backpack.tf/profiles/76561198032605488?time=1418803200

Sold for 2 buds + 17 keys + collector's professional killstreak Eviction notice

buds were 13-13.5 2 weeks ago (http://backpack.tf/vote/id/5482967ab88d8823398b4742)

Therefore sold for 2 buds + 1.56

3.56 rounded up to

3.6 buds

Mini on Professional Killstreak eviction notice:

http://www.tf2outpost.com/trade/18288803 B.O 4 keys

1 on SCM for 6.90 euros amounts to about 3.5 keys

1 on classified asking for 6 keys

Collectors Eviction notice priced at 2.2-2.3, professional kits starting from 2.65euros on SCM thus kit itself about 1.5 keys.

Thus Taking as 3.5 keys