Sale 1: Sold together with ~8.75 keys for Burning Flames A Rather Festive Tree (97.5) --> 88.75; rounding to 89 keys

https://backpack.tf/profiles/76561198339730272#!/compare/1512864000/1513036800

https://backpack.tf/profiles/76561198175665245#!/compare/1512864000/1513036800

Sale 2: Sold for Burning Flames Napper's Respite (90) + 13 keys pure + ~1key in items. --> caps at 100

https://backpack.tf/profiles/76561198175665245#!/compare/1513641600/1513728000

https://backpack.tf/profiles/76561198190084707#!/compare/1513641600/1513728000

B/O 100 http://www.tf2outpost.com/trade/29476300

Sale 3: Sold for Time Warp Towering Pillar of Hats

https://backpack.tf/profiles/76561198190084707#!/compare/1513728000/1513900800

Using this sale on the Towering Pillar

Sale 4: Sold for Frostbite Towering Titanium Pillar of Hats (51). One of the two Compare links says a Galactic Codex Captain Space Mann was added but the IDs do not match so excluding.

https://backpack.tf/profiles/76561198339730272#!/compare/1511568000/1511654400

https://backpack.tf/profiles/76561198192602363#!/compare/1511481600/1511568000

Sale X: Bulk for Misty Skull Crones Dome

https://backpack.tf/profiles/76561198115102647#!/compare/1510876800/1510963200

Sale X: Sold together with Circling Heart Soldier's Stash (112.5) for duped Scorching Flames Pyromancer's Mask --> bulky

https://backpack.tf/profiles/76561198192602363#!/compare/1511136000/1511222400

https://backpack.tf/profiles/76561198115102647#!/compare/1511136000/1511222400

Sales at 89, 100.

Suggesting range from 90 to 100.