Resuggestion, thanks to Blaze for the info!

Sale 1:

https://backpack.tf/profiles/76561198045399485#!/compare/1552262400/1552348800

https://backpack.tf/profiles/76561198202186637#!/compare/1552262400/1552348800

Bulk

Sale 2:

https://backpack.tf/profiles/76561197998850076#!/compare/1549584000/1549756800

https://backpack.tf/profiles/76561198071260200#!/compare/1549670400/1549756800

Sold with Showstopper Battin' for PS Counter

Used there

Sale 3:

https://backpack.tf/profiles/76561198071260200#!/compare/1549670400/1549756800

https://backpack.tf/profiles/76561198331167728#!/compare/1549670400/1549756800

Sold for Misty DeGroot + 7 keys

Used there

Sale 4:

https://backpack.tf/profiles/76561198331167728#!/compare/1549756800/1549843200

https://backpack.tf/profiles/76561198237338144#!/compare/1549756800/1549843200

Sold for DBD Yellow(62)

Sale 5:

https://backpack.tf/profiles/76561198237338144#!/compare/1550793600/1550880000

https://backpack.tf/profiles/76561198312583107#!/compare/1550793600/1550880000

Sold with 4 keys for PE Lucky(68)

Total is 64 keys

Sale 6:

https://backpack.tf/profiles/76561198312583107#!/compare/1551052800/1551139200

https://backpack.tf/profiles/76561198064381517#!/compare/1551139200/1551225600

Sold for TW Pullover

https://bot.tf/stats/listings/Y7GL7GWM

B/O of 70 keys

Use there

Blaze's Part:

https://marketplace.tf/items/110;5;u8 - sold for $120

sale ends up at ~67 keys.

seller at 65,

taking 62 - 67 to preserve around unsold.