I was involved in a trade that was used in the last suggestion. It had false information.

Sale 1:

http://backpack.tf/profiles/76561198022315950/#!/compare/1459814400/1460160000

GBH Company + 128 Keys + Duped Stormy Storm Heavy Duty Rag (8-10-ish).

Company man had a Buyout of 120 and was priced at 140 Outpost trade: http://www.tf2outpost.com/trade/27596445 Backpack pricing: http://backpack.tf/stats/Unusual/Company%20Man/Tradable/Craftable/71

As seen here: http://backpack.tf/item/1788895432 the Company man is now in http://backpack.tf/u/76561198054862332 's Inventory

As seen here: http://backpack.tf/item/282180171 the Hound Dog is in someone elses inventory: http://backpack.tf/u/76561198046131402

Proof of Hound Dog Trade

Duty Rag and 120 Keys: http://backpack.tf/profiles/76561198046131402?time=1459728000

My Backpack with Hound Dog and Company Man: http://backpack.tf/profiles/76561198022315950?time=1459814400

Hound Dog has a new owner + No Duty Rag: http://backpack.tf/profiles/76561198046131402?time=1460160000

Same day I have the KE and lost 8 keys to the day prior: http://backpack.tf/profiles/76561198022315950?time=1460160000

Duty Rag History (First Ally, then me then Aditya: http://backpack.tf/item/883497421

This proves that I got 120 Keys for the KE and that I paid the Duty Rag too.

So finally, the conclusion of this trade:

GBH Company Man (B/O 120, 140 Backpack.tf) 130 + 128 Keys Pure + Duped Duty Rag Stormy Storm 8-10 = 256-278

Sale 2:

http://backpack.tf/profiles/76561197995194055/#!/compare/1459641600/1459728000

41 Pure + White Bills + Peace KE for Sunbeams Rack (280) = 43 Keys Plus KE (250 at that time) vs. Sunbeams Rack (280)

Sold w/ 41 keys + 2 keys sweets for Beams Rack

280 - 43 = 237, rounding to 240 although you could always do that the other way around and just say that the one who sold the KE saw the Rack as 290+. Would say to middle the KE to 245 as we do not know who wanted to buy and who wanted to sell.

245 and ~267

Would set to 256