Resuggesting, since I made a small mistake in the last one. Thanks, Cashew, for pointing it out.

First sale

http://www.tf2outpost.com/trade/25618996 1:1 for a NnB Killer's Exclusive, ~32 keys (refer to mini below).

http://backpack.tf/profiles/76561198094844703?time=1429081200 Seller's bp before trade.

http://backpack.tf/profiles/76561198094844703?time=1429167600 Seller's bp after trade.

Second sale

http://www.tf2outpost.com/trade/25592741 1:1 for a Molten Mallard Death Cone, ~27 keys (refer to mini below)

http://backpack.tf/profiles/76561198109451379?time=1428649200 Seller's bp before trade.

http://backpack.tf/profiles/76561198109451379?time=1428735600 Seller's bp after trade.

Mini for NnB Killer's Exclusive

http://www.tf2outpost.com/trade/25728465 NnB KE + 8 keys for a Green Energy Demoman's Fro, (42-8)*0.9=32 keys.

http://backpack.tf/profiles/76561198038342407?time=1429081200 Seller's bp before trade.

http://backpack.tf/profiles/76561198038342407?time=1429945200 Seller's bp after trade.

Mini for Molten Mallard Death Cone

http://www.tf2outpost.com/trade/25673583 1:1 for a Pink Max's Severed Head, ~27 keys.

http://backpack.tf/profiles/76561198109451379?time=1429254000 Seller's bp before trade.

http://backpack.tf/profiles/76561198109451379?time=1429426800 Seller's bp after trade.

That's all the proof I can get for now. Not sure whether duped Unusual sales count as valid proof or not, so I stayed away from them, though if they are valid, I'll probably close this and search for more proof. Again, I've probably made some mistakes, so I really appreciate it if you guys point them out for me.

As always, any constructive feedback, additional proof and counter proof is extremely welcome. That's all for now, have a nice day!