The 6th time is the charm! Looks like it's staying the same

Sale 1: I Paid 20 keys

https://next.backpack.tf/profiles/76561198064724507/compare?from=1657756800&to=1657843200

Sale 2: I sold it for a Restless Wraiths Head Bouncers (recently suggested at 17-21 keys, 19 keys) plus 7 keys in taunts and sweets --- 26 keys

https://next.backpack.tf/profiles/76561198064724507/compare?from=1657756800&to=1657843200

https://next.backpack.tf/profiles/76561199015972173/compare?from=1648598400&to=1657843200

Victory Lap Taunt- 4.1 keys

Classifieds - backpack.tf

The Dueling Banjo- 1.8 keys

Classifieds - backpack.tf

Fresh Brewed Victory- 33.33 ref

Keys are at 64.88 ref Mann Co. Supply Crate Key - backpack.tf

33.33/64.88= 0.51 keys = ~0.5 keys

Classifieds - backpack.tf

Tour of duty Ticket- 32.55 ref

32.55/64.88= 0.501 keys = ~0.5 keys

Classifieds - backpack.tf

Strange part Unusual Wearing Players Killed: 34 ref

34/64.88= 0.52 keys = ~0.5 keys

Classifieds - backpack.tf

Balloniphones- 28.22 ref

28.22/64.88= 0.43 keys = ~0.4 keys

Classifieds - backpack.tf

19+ 4.1+1.8+.5+.5+.5+.5+.4 keys= 26.4 keys ~ 26 keys, since we should rounding to the nearest key(Credit to The Real Slim Strange).

We can exclude this sale, since we got two unsold on Marketplace.tf at around 22 keys, (40.99/1.83) https://marketplace.tf/items/tf2/671;5;u32 (Credits to Mitk)

Sale 3) O.planets Brown Bomber sold on marketplace.tf

https://marketplace.tf/items/tf2/671;5;u32

$1.83 per key

40.99/1.83 = ~ 22.3 keys = ~ 22 keys

Excluding the 26 key sale, Sales at 20 and 22 keys, the range 20 keys- 22 keys would suffice.)

Thanks and have a great day!