I'll Heph and I'll Peph and I'll blow the house down.

https://backpack.tf/item/7719698790

Sale 1) Bulk sale

https://backpack.tf/profiles/76561198313294470#!/compare/1556323200/1556582400

https://backpack.tf/profiles/76561198053763983#!/compare/1556496000/1556582400

Sale 2) ?

https://backpack.tf/profiles/76561198053763983#!/compare/1556668800/1556755200

https://backpack.tf/profiles/76561198341171690#!/compare/1556668800/1556755200

https://backpack.tf/item/7615386503

Sale 3) Uh

https://backpack.tf/profiles/76561198137316054#!/compare/1556150400/1556236800

https://backpack.tf/profiles/76561198314776045#!/compare/1556150400/1556236800

Sale 4) Sold for 58 Keys + 2 Refined

https://backpack.tf/profiles/76561198314776045#!/compare/1556236800/1556582400

Rounds to 58 Keys

https://backpack.tf/item/7465738068

Sale 5) Sold for 60 Keys

https://backpack.tf/profiles/76561198210673328#!/compare/1553558400/1553644800

Sale 6) Sold for a Strange WW Hot Quack Canvassed Sniper Rifle + 16 Keys

https://backpack.tf/profiles/76561198002757046#!/compare/1553990400/1554076800

This can be used for the Sniper. Its only other sale is bulk.

https://backpack.tf/item/7301722535

Sale 7) Sold for 79 Keys

https://backpack.tf/profiles/76561198146220878#!/compare/1550620800/1550880000

High outlier.

https://backpack.tf/item/7253291383

Sale 8) Bulk sale

https://backpack.tf/profiles/76561198162120088#!/compare/1551225600/1551312000

Sale 9) Sold for a Knifestorm Bombing Run (55 Keys)

https://backpack.tf/profiles/76561198046218075#!/compare/1554768000/1554854400

Sale 10) Sold + Circling Peace Sign Respectless Rubber Glove for a Terror-Watt Crone's Dome (74 Keys) + 4 Keys

https://backpack.tf/profiles/76561198796559482#!/compare/1554854400/1554940800

Fits in the range.

Sale 11) Sold for a Disco Beat Down Noble Amassment of Hats (40 Keys) + Disco Beat Down Rebel Rouser (27 Keys) + 3 Keys

https://backpack.tf/profiles/76561198158206236#!/compare/1556496000/1556582400

40 + 27 + 3 = 70 Keys

Noble Mini

https://backpack.tf/suggestion/5cd5d4cc67807246c46bfdcf - 40 Keys

Rebel Mini

https://backpack.tf/suggestion/5cd5edc3d3817278867d7e88 - 27 Keys

Sale 12) Sold for an Aussie Scatter (~25 Keys) + Planets Allbrero + ~10 Keys of Items and Refined + 6 Keys

https://backpack.tf/profiles/76561198244409420#!/compare/1556668800/1556755200

Fits in the range.

Sale 13) Quicksold for 50 Keys

https://backpack.tf/profiles/76561198056285342#!/compare/1556755200/1556841600

https://backpack.tf/item/7265664794

Sale 14) Sold for 63 Keys

https://backpack.tf/profiles/76561198826453262#!/compare/1552780800/1552867200

Sale 15) Sold for a Starstorm Insomnia Killer Exclusive (71 Keys)

https://backpack.tf/profiles/76561198112516663#!/compare/1554163200/1554249600

https://backpack.tf/profiles/76561198218497692#!/compare/1554163200/1554249600

Killer Exclusive Mini

https://backpack.tf/suggestion/5cd61e2ad381721b692ad94a - 71 Keys

Sale 16) Sold for a Purple Energy Waxy Wayfinder (49.5 Keys) + 9 Keys

https://backpack.tf/profiles/76561198218497692#!/compare/1554940800/1555027200

https://backpack.tf/profiles/76561198859721638#!/compare/1554854400/1555027200

49.5 + 9 = 58.5, which rounds to 59 Keys

Waxy Mini

https://backpack.tf/suggestion/5cd5f3af67807260b339ab58 - 49.5 Keys

Sale 17) ?

https://backpack.tf/profiles/76561198859721638#!/compare/1555027200/1555113600

https://backpack.tf/profiles/76561198047819527#!/compare/1555027200/1555113600

Sale 18) Sold for a Sunbeams Detective Noir (50.5 Keys) + 16 Keys

https://backpack.tf/profiles/76561198047819527#!/compare/1555027200/1555113600

https://backpack.tf/profiles/76561198846276257#!/compare/1554508800/1555113600

50.5 + 16 = 66.5, which rounds to 67 Keys

Noir Mini

https://backpack.tf/suggestion/5cd8a73bd381725b8e384d21 - 50.5 Keys

Sale 19) Sold + 15 Keys for a Duped Scorching Flames Ye Olde Baker Boy

https://backpack.tf/profiles/76561198846276257#!/compare/1555545600/1555632000

https://imgur.com/a/AxsSxht - Had a Buyout of 67 Keys. This sale is either capped at 67 or fits in the range.

https://backpack.tf/item/7374553524

Sale 20) Sold for 60 Keys

https://backpack.tf/profiles/76561198144936805#!/compare/1552348800/1553126400

https://backpack.tf/profiles/76561198256438505#!/compare/1552262400/1552348800

Sale 21) Sold for a Burning Flames Towering Pillar of Hats + ~1.5 Keys of Items

https://backpack.tf/profiles/76561198256438505#!/compare/1552435200/1552521600

High outlier.

Sale 22) Bulk sale for a Scorching Flames Condor Cap

https://backpack.tf/profiles/76561198289372905#!/compare/1552608000/1552694400

Sale 23) Bulk sale for a Duped Stormy 13th Hour Bonk Boy

https://backpack.tf/profiles/76561198040280241#!/compare/1552694400/1552780800

Sale 24) Bulk sale involving the Pullover

https://backpack.tf/profiles/76561198056793885#!/compare/1553126400/1553212800

https://backpack.tf/profiles/76561198361129578#!/compare/1553126400/1553212800

Sale 25) Sold for 63 Keys

https://backpack.tf/profiles/76561198361129578#!/compare/1553299200/1553385600

Sale 26) Sold for 55 Keys

https://backpack.tf/profiles/76561198157522476#!/compare/1554595200/1554681600

Sale 27) Sold for a Frostbite Big Country + Purple Confetti Magistrate's Mullet (13 Keys)

https://backpack.tf/profiles/76561198008994962#!/compare/1556236800/1556496000

https://backpack.tf/profiles/76561198194672445#!/compare/1556409600/1556496000

Not a good sale for either hat this or the Big Country.

Sale 28) Quicksold for 58 Keys + ~1 Key of Items

https://backpack.tf/profiles/76561198194672445#!/compare/1556409600/1556496000

58 + 1 = 59 Keys

Sale 29) Sold + 6 Keys + Squeezebox (~1 Key) for a Green Confetti DCO (37 Keys) + Circling Heart Warhood + Spec KS Aussie Knife (~18 Keys)

https://backpack.tf/profiles/76561198351184262#!/compare/1557187200/1557273600

https://scrap.tf/auctions/IXPRVT

Fits in the range.