Sale 1: https://backpack.tf/profiles/76561198859721638#!/compare/1592352000/1592438400

69 full pure

Sale 2: https://backpack.tf/profiles/76561198118157202#!/compare/1590624000/1590710400

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Sale 3: https://backpack.tf/profiles/76561198376445034#!/compare/1585612800/1585958400

Aussie sniper rifle (26) + Aussie Scattergun (30) + 10 keys.

Rounding to 66 keys.

Sale 4: https://backpack.tf/profiles/76561198025824592#!/compare/1590364800/1590537600

This hat plus keys for a sunbeams Cotton head, better used there

Sale 5: https://backpack.tf/profiles/76561198453055175#!/compare/1589760000/1589846400

51 keys, using as an outlier since all other sellers at that time were at 67 keys: https://bot.tf/stats/listings/MGLG2XO3

Sale 6: https://backpack.tf/profiles/76561198453055175#!/compare/1589068800/1589241600

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Sale 7: https://backpack.tf/profiles/76561198025824592#!/compare/1588291200/1588464000

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https://marketplace.tf/items/tf2/30001;5;u13

Sold on May 16th for 144 USD,

Keys were 1.89 USD, rounding to 76 keys.