Sale 1:

https://backpack.tf/profiles/76561198197292179#!/compare/1590364800/1590537600

https://backpack.tf/profiles/76561197964171516#!/compare/1590278400/1590537600

Untrace.

Sale 2:

https://backpack.tf/profiles/76561197964171516#!/compare/1591401600/1591488000

https://backpack.tf/profiles/76561198087761315#!/compare/1591228800/1591660800

Sold for Taunt: The Dueling Banjo (1.38) + Taunt: Rancho Relaxo (0.68) + Rifleman's Regalia (1.35)

+ The Giger Counter (https://gyazo.com/d01a856eac655fd7858e06d642f427a0 , bp price too low so gonna take 3 keys here)

+ The Shooting Star (1.18) + Specialized Killstreak C.A.P.P.E.R (3, https://gyazo.com/c9c849f0e7e0d4e79b45c24986ebdac7)

+ Starduster (1.93) + Vintage Specialized Killstreak Lugermorph (7, https://gyazo.com/addf469c16a0caf4208cf899bb2df1fc)

+ Non-Craftable Unusual Taunt: Kazotsky Kick Unusualifier (20, https://gyazo.com/eb08c02238273d69345ce2b9ed32e1bf)

= 36.52, rounding to 37 keys.

Sale 3:

https://backpack.tf/profiles/76561198087761315#!/compare/1593043200/1593302400

https://backpack.tf/profiles/76561198064658655#!/compare/1593043200/1593302400

Untrace.

Sale 4:

https://marketplace.tf/items/tf2/31042;5;u136 - $70 / $2.05 = 34.15 keys = 34 keys

No B/O

Sales: 34, 37

Going with 34-37 keys.