#Squad-1, ~Zeckatz.

Sale 1: Untrace.

https://backpack.tf/profiles/76561198029074524#!/compare/1555977600/1556064000 (Broken af)

https://backpack.tf/profiles/76561198300861946#!/compare/1554595200/1555977600

Sale 2: Broken.

https://backpack.tf/profiles/76561198300861946#!/compare/1555977600/1557705600

https://backpack.tf/profiles/76561198834678807#!/compare/1554681600/1556582400 (Warning :p)

Sale 3: ~4 Keys.

https://backpack.tf/profiles/76561198850667931#!/compare/1550966400/1551830400

https://backpack.tf/profiles/76561198080179568#!/compare/1551744000/1551830400

Sale 4: Untrace.

https://backpack.tf/profiles/76561198080179568#!/compare/1551830400/1551916800

https://backpack.tf/profiles/76561198128537186#!/compare/1551398400/1552089600

Sale 5: Untrace.

https://backpack.tf/profiles/76561198164642772#!/compare/1554076800/1554595200

https://backpack.tf/profiles/76561198420918019#!/compare/1554681600/1555632000

Sale 6: ~3 Keys.

https://backpack.tf/profiles/76561198335791307#!/compare/1554681600/1554768000

https://backpack.tf/profiles/76561198169365132#!/compare/1554681600/1554768000

Sale 7: Untrace.

https://backpack.tf/profiles/76561198169365132#!/compare/1554768000/1554854400

https://backpack.tf/profiles/76561198305676157#!/compare/1554854400/1554940800

Sale 8: Bulk.

https://backpack.tf/profiles/76561198049884052#!/compare/1553990400/1554076800

https://backpack.tf/profiles/76561198080179568#!/compare/1553990400/1554076800

Marketplace.tf Sales:

https://marketplace.tf/items/1109;5;u3001

Sale 9: ~5 Keys.

Mar 8

$8.99 / $1.8 = 4.99 keys

Sale 10: ~4 Keys.

Mar 31

$7.99 / $1.79 = 4.46 keys

Sale 11: ~3.5 Keys.

Mar 31

$6.27 / $1.79 = 3.50 keys

Sale 12: ~5 Keys.

Apr 4

$8.79 / $1.79 = 4.91 keys

Sale 13: ~5 Keys.

Apr 8

$8.79 / $1.78 = 4.94 keys

Sale 14: ~3.5 Keys.

Apr 14

$6.28 / $1.77 = 3.55 keys

Sale 15: ~5 Keys.

Apr 15

$8.70 / $1.77 = 4.92 keys

Sale 16: ~3.5 Keys.

Apr 15

$6.27 / $1.77 = 3.54 keys

https://gyazo.com/b1472d9952b5677f218fd134f88b2c7e

https://bot.tf/stats/item?def=1109&q=5&ef=Showstopper&craft=1&aus=0&ks=0

Sales: 3/3.5/3.5/3.5/4/4/5/5/5/5

Going With 3-5 Keys. (Thank's to jarool)