#Squad-1, ~Zeckatz.

Sale 1: Untrace.

https://backpack.tf/profiles/76561198254543519#!/compare/1552176000/1554508800

https://backpack.tf/profiles/76561198206030611#!/compare/1552089600/1552176000

https://backpack.tf/item/7703744836

https://backpack.tf/item/6974432831

https://backpack.tf/item/6922477944

https://backpack.tf/item/6902688626

(Gambling, Untrace, Transfer)

Sale 2: Untrace.

https://backpack.tf/profiles/76561198075815619#!/compare/1555545600/1555632000

https://backpack.tf/profiles/76561198063143114#!/compare/1555459200/1555545600

Sale 3: ~4 Keys Pure.

https://backpack.tf/profiles/76561198063143114#!/compare/1555804800/1555891200

https://backpack.tf/profiles/76561198176974082#!/compare/1555804800/1555891200

Sale 4: Untrace.

https://backpack.tf/profiles/76561198394903250#!/compare/1553385600/1553472000

https://backpack.tf/profiles/76561197992703391#!/compare/1553299200/1553385600

Sale 5: Untrace.

https://backpack.tf/profiles/76561198394903250#!/compare/1553731200/1553904000

Sale 6: Untrace/Low.

https://backpack.tf/profiles/76561198102806068#!/compare/1553731200/1553817600

https://backpack.tf/profiles/76561198340634356#!/compare/1553731200/1553817600

Sale 7: ~3 Keys Pure.

https://backpack.tf/profiles/76561198873165470#!/compare/1557273600/1557360000

https://backpack.tf/profiles/76561198312265776#!/compare/1557273600/1557360000

Marketplace.tf Sales:

https://marketplace.tf/items/1114;5;u3005

2x (4 Keys) Feb.

3x (4.5 keys) Mar.

1x (5.5 keys) Apr.

1x (3.5 keys) apr.

https://gyazo.com/adb1fd91a93746232f71f71b60ad0ee2

https://bot.tf/stats/item?def=1114&q=5&ef=Fountain+of+Delight&craft=1&aus=0&ks=0

2x (3 keys)

4x (3.5 keys)

2x (5 keys)

Including Sales: 3/3/3.5/3.5/3.5/3.5/3.5

Going With 3-3.5 Keys. (Thanks to shufflespy <3)