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10 months old price.
Sale 1: 25 keys pure
http://backpack.tf/profiles/76561198051925253#!/compare/1491868800/1491955200
Sale 2: 28 keys pure (ID of one of the keys doesn't match)
http://backpack.tf/profiles/76561198203188775#!/compare/1492819200/1493337600
Excluding sales with banned users found in here http://backpack.tf/item/2001430320
Suggesting range from 25-28 keys