Credits to Shuffle Spy!

New Polar sales:

https://backpack.tf/profiles/76561198121326314#!/compare/1640304000/1640476800 - 533 Keys + Stormy Cat Pajamas (no sales)

https://backpack.tf/profiles/76561198075581725#!/compare/1640649600/1640736000 - Bulk sale

https://backpack.tf/profiles/76561198859721638#!/compare/1640736000/1640822400 - 655 Keys

https://backpack.tf/profiles/76561198055847835#!/compare/1641513600/1641686400 - Bulk

Additional Blast sales:

https://backpack.tf/profiles/76561197990998139#!/compare/1636329600/1636416000 - ?

https://backpack.tf/profiles/76561197982127154#!/compare/1637193600/1637280000 - Somewhere around the upper-300s

https://backpack.tf/profiles/76561198007696852#!/compare/1637366400/1637452800 - Use for the Warhood

https://backpack.tf/profiles/76561197990998139#!/compare/1637280000/1637366400 - 350 Keys

https://backpack.tf/profiles/76561198077784491#!/compare/1636416000/1636502400 - ?

https://backpack.tf/profiles/76561198125896125#!/compare/1636848000/1636934400 - Bulk

https://backpack.tf/profiles/76561198285371555#!/compare/1640131200/1640217600 - I hope this wasn't a 1:1

https://backpack.tf/profiles/76561198153818314#!/compare/1639094400/1639180800 - 330 Keys

https://backpack.tf/profiles/76561198043808939#!/compare/1634860800/1634947200 - Little low

https://backpack.tf/profiles/76561198847680167#!/compare/1635033600/1635120000 - Little high

https://backpack.tf/profiles/76561198232041512#!/compare/1636329600/1636243200 - ?

https://backpack.tf/profiles/76561198129205357#!/compare/1639958400/1640131200 - 365 Keys

https://backpack.tf/profiles/76561198012537041#!/compare/1638662400/1638748800 - ?

https://backpack.tf/profiles/76561198001634629#!/compare/1639440000/1639612800 - Cloudy Chapeau + Pro KS Aussie Medi + 33 Keys

https://backpack.tf/profiles/76561198001634629#!/compare/1642032000/1642118400 - The Chapeau sold here for 350 Keys

Taking 350 for the Chapeau gives the Blast a sale at ~470 Keys. A range of 330 - 470 would work for the Blast with its current sellers.

The Steaming Rack got updated to 190 Keys, so sale 1 is also ~730 Keys.

665 to 730 would work as a range for the Polar. (I assume you meant 655 here given the sale you listed)

Credits to khiro for a sale:

https://backpack.tf/profiles/76561198125086452#!/compare/1638576000/1638748800

https://cdn.discordapp.com/attachments/556751260636938261/917514706158243870/unknown.png

2x Holiday Headcase (73) + Pumpkin Moon Blast Defense + Smoking Brainiac Hairpiece (64.5) + Steaming Exquisite Rack (bo at 140)

[Pumpkin Moon Blast Defense mini (outdated, see above):

https://backpack.tf/profiles/76561198024176550#!/compare/1634083200/1634169600

https://backpack.tf/profiles/76561198869144080#!/compare/1634083200/1634169600

Sunbeams Blast Defense (~87) + Disco Beat Down Brainiac Hairpiece (195) = 282k

https://backpack.tf/profiles/76561198045327094#!/compare/1634169600/1634428800

https://backpack.tf/profiles/76561198001634629#!/compare/1634083200/1634428800

Death by Disco Prehistoric Pullover (287) + Strange Coffin Nail Rocket Launcher (Minimal Wear) + Strange Coffin Nail Grenade Launcher (Minimal Wear) + Strange Coffin Nail Shotgun (Minimal Wear)

don't know how to value strange coffin nail skins

https://backpack.tf/profiles/76561198001634629#!/compare/1634428800/1634515200

https://backpack.tf/profiles/76561198146046621#!/compare/1634342400/1634515200

like somewhere 540-590k? seems high

https://backpack.tf/profiles/76561198146046621#!/compare/1635292800/1635379200

https://backpack.tf/profiles/76561198129205357#!/compare/1635292800/1635379200

Ancient Eldritch Prehistoric Pullover (90 bo) + Burning Flames Combustible Kabuto (65 bo) +

Sunbeams Hunter in Darkness (101 bo) + ~300 keys = 556k

560k B/O https://gladiator.tf/listings/617a81d97b7c927dbd0233d8, so prob just put this sale at 560.

~280-560k, gives 420k midpoint.]

73 + 420 + 64.5 + 140 = ~700k

https://backpack.tf/item/2805166450 - clean

https://backpack.tf/profiles/76561198246045168#!/compare/1630195200/1630281600

https://backpack.tf/profiles/76561198285371555#!/compare/1630195200/1630281600

added for Perennial Petals Ballooniphones, use there

https://backpack.tf/profiles/76561198285371555#!/compare/1631318400/1631404800

https://backpack.tf/profiles/76561198263190057#!/compare/1631059200/1631318400

dunno, alt?

https://backpack.tf/profiles/7656119826190057#!/compare/1631404800/1631491200

https://backpack.tf/profiles/76561198061489334#!/compare/1631318400/1631404800

guessing this sold for some amount of keys, no idea how much, previous sellers at 700-800k, buy orders 500k+ https://gladiator.tf/listings/613ce0f95a603c5a1c1d704d

MP:

https://marketplace.tf/items/tf2/30329;5;u58

https://manic.tf/keyprice/?at=2021-11-18&site=marketplace.tf

Nov 18, $1400/1.92=729.17, rounds to 730k.

seller at 700 for some time but that one's a dupe: https://gladiator.tf/listings/614f82cbdb99df694852968d

https://backpack.tf/item/2536613367

sale at 600k used in previous suggestion is just barely outdated: https://cdn.discordapp.com/attachments/556751260636938261/876633659464118322/unknown.png

655-730.