Sale #1:

http://www.tf2outpost.com/trade/27148996 SCM likely

http://backpack.tf/profiles/76561198072583032?time=1446102000 (October 29th)

http://backpack.tf/profiles/76561198072583032?time=1446274800 (October 31st)

Sale #2:

http://www.tf2outpost.com/trade/27129398

Quick-sold for 12 keys

http://backpack.tf/profiles/76561198076357258?time=1443337200 (September 27th)

http://backpack.tf/profiles/76561198076357258?time=1443510000 (September 29th)

Sale #3:

Sold for a ton of items, likely around the same value as the previous sale.

http://backpack.tf/profiles/76561198197215790?time=1443250800 (September 26th)

http://backpack.tf/profiles/76561198197215790?time=1443337200 (September 27th)

Sale #4:

http://backpack.tf/profiles/76561198101325132?time=1442473200 (September 17th)

http://backpack.tf/profiles/76561198101325132?time=1442559600 (September 18th)

I don't even know.

Sale #5 (and pretty much the only valid sale here):

http://www.tf2outpost.com/trade/27310893 Sold for 18 keys

http://i.imgur.com/kQpwBTy.png

I was also offered (and rejected) 16 keys in the same trade.