Credit to Boom(insert random characters before and after your name) for the mini :D

Your KE suggestion is now okay because your sale involving the DBD Milkman is now invalid :P

Sale 1:

Sold for an Australium Rocket Launcher

(49 - 1) = 48 keys

http://www.tf2outpost.com/trade/25787389

http://backpack.tf/profiles/76561198052176605?time=1429858800 (April 24th)

http://backpack.tf/profiles/76561198052176605?time=1429945200 (April 25th)

Sale 2:

Sold for Bubbling Killer Exclusive + 1 key of sweets

(46 + 1)*0.9 = 40.4 rounding to 40 keys

No outpost trade

http://backpack.tf/profiles/76561198150064699?time=1429772400 (April 23rd)

http://backpack.tf/profiles/76561198150064699?time=1429858800 (April 24th)

Notes:

Mini for the Bubbling Killer Exclusive: ~43

http://backpack.tf/profiles/76561198128140730?time=1431799272 (sold for a anti freeze electric escorter + 4 keys sweets)

Mini for escorter: http://backpack.tf/vote/id/555128e0b98d88594d8b45f2 (47 keys so thats 51 keysx0.9= 46 keys)

Conclusion:

Sales at 40 and 48 keys.