Resuggestion due to bad range. Thanks to K1ng for the clarification!

Sale 1:

https://backpack.tf/profiles/76561198305979455#!/compare/1562803200/1563840000

https://backpack.tf/profiles/76561198312583107#!/compare/1563753600/1563840000

QS

Sale 2:

https://backpack.tf/profiles/76561198312583107#!/compare/1564272000/1564444800

https://backpack.tf/profiles/76561198050439860#!/compare/1564358400/1564444800

Keys

Sale 3:

https://backpack.tf/profiles/76561198050439860#!/compare/1565654400/1565827200

https://backpack.tf/profiles/76561198341171690#!/compare/1565568000/1565654400

Keys

Sale 4:

https://backpack.tf/profiles/76561198341171690#!/compare/1566000000/1566086400

https://backpack.tf/profiles/76561198832759377#!/compare/1566086400/1566172800

Sold for 11 keys

Sale 5:

https://backpack.tf/profiles/76561198335791307#!/compare/1564272000/1564358400

https://backpack.tf/profiles/76561198303467148#!/compare/1564272000/1565308800

Sold for 11 keys

Sale 6:

https://backpack.tf/profiles/76561198086303790#!/compare/1567900800/1567987200

https://backpack.tf/profiles/76561197964171516#!/compare/1567900800/1567987200

Bulk

sale 7:

https://backpack.tf/profiles/76561198337734785#!/compare/1561075200/1561161600

https://backpack.tf/profiles/76561198346222059#!/compare/1560556800/1565913600

Untrace

Sale 8:

https://backpack.tf/profiles/76561198181758350#!/compare/1562716800/1563148800

https://backpack.tf/profiles/76561198425999227#!/compare/1562630400/1563148800

Sold for Grail Sorcery + ~2 keys in sweets

based on sellers, would end up low

Sale 9:

https://backpack.tf/profiles/76561198312583107#!/compare/1561248000/1561334400

https://backpack.tf/profiles/76561198845649571#!/compare/1561334400/1562025600

Keys

sale 10:

https://backpack.tf/profiles/76561198845649571#!/compare/1561334400/1562025600

https://backpack.tf/profiles/76561198286968297#!/compare/1561939200/1562025600

Untrace

Sale 11:

https://backpack.tf/profiles/76561198286968297#!/compare/1562025600/1562112000

https://backpack.tf/profiles/76561198841279602#!/compare/1562025600/1562112000

QS

sale 12:

https://backpack.tf/profiles/76561198841279602#!/compare/1564963200/1565049600

https://backpack.tf/profiles/76561198335791307#!/compare/1564963200/1565049600

QS?

Sale 13:

https://backpack.tf/profiles/76561198335791307#!/compare/1566864000/1566950400

https://backpack.tf/profiles/76561198231266680#!/compare/1566864000/1566950400

Sold for 11 keys

Sale 14:

https://backpack.tf/profiles/76561198402399420#!/compare/1560556800/1560729600

https://backpack.tf/profiles/76561198341171690#!/compare/1560643200/1560729600

Sold for 10 keys

Sale 15:

https://backpack.tf/profiles/76561198341171690#!/compare/1560988800/1561075200

https://backpack.tf/profiles/76561198799702780#!/compare/1557187200/1561593600

Sold for ~10 keys

Sale 16:

https://backpack.tf/profiles/76561198799702780#!/compare/1564272000/1566432000

https://backpack.tf/profiles/76561198323565601#!/compare/1564185600/1564272000

QS

Sale 17:

https://backpack.tf/profiles/76561198091142935#!/compare/1561766400/1561852800

https://backpack.tf/profiles/76561198027152204#!/compare/1561680000/1561766400

Untrace

Sale 18:

https://backpack.tf/profiles/76561198044281778#!/compare/1561766400/1561852800

https://backpack.tf/profiles/76561198341171690#!/compare/1561766400/1561852800

QS to bot

sale 19:

https://backpack.tf/profiles/76561198341171690#!/compare/1562284800/1562371200

https://backpack.tf/profiles/76561198257958253#!/compare/1559174400/1562371200

Sold for 11 keys

Sale 20:

https://backpack.tf/profiles/76561198337734785#!/compare/1565654400/1565740800

https://backpack.tf/profiles/76561198108050155#!/compare/1565654400/1565740800

Keys

sale 21:

https://backpack.tf/profiles/76561198108050155#!/compare/1565913600/1566086400

https://backpack.tf/profiles/76561198051889174#!/compare/1566000000/1566086400

Bulk

Sale 22:

https://backpack.tf/profiles/76561198051889174#!/compare/1566000000/1566086400

https://backpack.tf/profiles/76561198142110950#!/compare/1566000000/1566086400

Bulk

Sale 23:

https://backpack.tf/profiles/76561198142110950#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198273493061#!/compare/1566172800/1566259200

Sold for 12 keys

sale 24:

https://backpack.tf/profiles/76561198101829283#!/compare/1561507200/1562803200

https://backpack.tf/profiles/76561198043936328#!/compare/1561680000/1561766400

Untrace

Sale 25 - 27:

https://marketplace.tf/items/tf2/30984;5;u61

$15.14 / $1.84 = 8.23 keys

$26.99 / $1.83 = 14.75 keys <-- https://backpack.tf/item/7162392809 | https://bot.tf/stats/listings/Y7PL6QNM B/O of 15 keys

$23 / $1.83 = 12.57 keys

Bot.tf:

https://bot.tf/stats/item?def=30984&q=5&ef=Miami%20Nights&craft=1&aus=0&ks=0

1 sale @ ~8 keys,

2 sales @ ~9.5 keys,

5 sales @ ~10 keys,

4 sales @ 11 keys,

Total sales @:

8 (x2)

9.5 (x2)

10 (x7)

11(x6)

12

13

15

Buyers up to ~7.5 keys,

aging seller at 12,

poorly bumped seller at 13,

gonna call 15 high,

calling 8 low,

taking 10 - 13 keys