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Sale 1: ~10 Keys Pure.
https://backpack.tf/profiles/76561198021055079#!/compare/1561161600/1561248000
https://backpack.tf/profiles/76561198129154174#!/compare/1561248000/1561507200
Sale 2: ~8 Keys Pure.
https://backpack.tf/profiles/76561198335791307#!/compare/1556496000/1556582400
https://backpack.tf/profiles/76561198025083656#!/compare/1556236800/1556582400
https://bot.tf/stats/item?def=1112&q=5&ef=Flammable+Bubbles+of+Attraction&craft=1&aus=0&ks=0
https://marketplace.tf/items/tf2/1112;5;u3018
Sale 3: ~11 Keys.
Apr 11
$19.93 / $1.77 = 11.26 keys.
Sale 4: ~10 Keys.
May 30
$17.75 / $1.82 = 9.75 keys
Sale 5: ~11 Keys.
Jun 21
$19.93 / $1.84 = 10.83 keys
Sales: 8/10/10/11/11
Going with 8-11 keys.
Thanks to scourge for the premium!