Sale 1:

Sold for a Cloud 9 Flamboyant Flamenco

(42*0.9) = 37.8 rounding to 38 keys

http://www.tf2outpost.com/trade/25883268

http://backpack.tf/profiles/76561198010353356?time=1430982000 (May 7th)

http://backpack.tf/profiles/76561198010353356?time=1431241200 (May 10th)

Sale 2:

Sold for a Nuts n' Bolts Hetman's Headpiece, a Steaming Industrial Festivizer and a Searing Plasma Tippler's Tricorne

(36*0.9) = 32.4 rounding to 34 keys

http://www.tf2outpost.com/trade/25984392

http://backpack.tf/profiles/76561198119518747?time=1431846000 (May 17th)

http://backpack.tf/profiles/76561198119518747?time=1431932400 (May 18th)

Notes:

Mini for the Nuts n' Bolts Hetman's Headpiece:

B/O of 10 for 6 days

Mini for the Steaming Industrial Festivizer:

Sold for 13 keys

http://www.tf2outpost.com/trade/25996215

http://backpack.tf/profiles/76561198071553799?time=1432105200 (May 20th)

http://backpack.tf/profiles/76561198071553799?time=1432191600 (May 21st)

Conclusion:

Sales at 38 and 34, taking the final range at 34 to 38.