Steamed Rice

https://backpack.tf/item/4989414327

Sale 1) ?

https://backpack.tf/profiles/76561198453055175#!/compare/1552262400/1552348800

Sale 2) Sold for a Circling Heart Detective Noir + Purple Confetti Le Party Phantom

https://backpack.tf/profiles/76561198337734785#!/compare/1552521600/1552608000

https://backpack.tf/profiles/76561198082587309#!/compare/1552608000/1552694400

https://imgur.com/a/2NDws8W - Capped by the Buyout of 36 Keys

Sale 3) Sold for 35 Keys

https://backpack.tf/profiles/76561198161481285#!/compare/1555545600/1555632000

https://backpack.tf/profiles/76561198444839741#!/compare/1555113600/1555632000

https://backpack.tf/item/6427137843

Sale 4) Sold for 34 Keys

https://backpack.tf/profiles/76561198136760233#!/compare/1553904000/1553990400

https://backpack.tf/profiles/76561198345117502#!/compare/1553990400/1554163200

The Safe'n'Sound first sold for the Keys.

Sale 5) Sold + Earbuds (~3 Keys) for a Disco Beat Down Noble Amassment of Hats

https://backpack.tf/profiles/76561198345117502#!/compare/1554422400/1555372800

https://backpack.tf/profiles/76561198838447026#!/compare/1555027200/1555200000

Using this to price the Noble.

Sale 6) ?

https://backpack.tf/profiles/76561198838447026#!/compare/1555200000/1555372800

https://backpack.tf/profiles/76561198277894721#!/compare/1555286400/1555372800

Sale 7) Looks like an SCM sale

https://backpack.tf/profiles/76561198277894721#!/compare/1555718400/1556064000

https://backpack.tf/profiles/76561198342161127#!/compare/1555977600/1556064000

https://marketplace.tf/items/30177;5;u36 - Sold for $47.56 (low outlier) and $69.90 when Keys were ~$1.78 each

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

69.9 / 1.78 = 39.26, which rounds to 39 Keys