Sale 1:
https://backpack.tf/profiles/76561198057124378#!/compare/1512086400/1512259200
stately + phosphorus plumbers ( 21 keys) for steaming galvanized gibus
gibus mini:
sold for stormy topper (34 keys)

34 - 21 = 13 keys

https://backpack.tf/item/1441070925
other sales with tf2mart hard to trace
sale with a scammer unusable
only 1 valid sale I believe. Correct me if I am wrong.