https://backpack.tf/item/12264522959

Sold alongside 80 keys for a Pyroland Daydream Woolen Warmer (bulk):

https://backpack.tf/profiles/76561198181581553#!/compare/1706313600/1707609600

https://backpack.tf/profiles/76561199213304560#!/compare/1705881600/1706313600

16 keys + Robin Walkers:

https://backpack.tf/profiles/76561199213304560#!/compare/1706313600/1706486400

https://backpack.tf/profiles/76561198317361621#!/compare/1706400000/1706486400

Robin Walkers were ~3 keys https://gladiator.tf/sales?item=Robin%20Walkers&at=2024-01-27T14:39:17.259Z

16+3=19, Taking 19 keys here

Buyout was 20 https://next.backpack.tf/classifieds/snapshots/Beaming%20Beacon%20Taunt:%20The%20Homerunner's%20Hobby/65b670b43098b2cfad11d0cb

(keys were accepted at 64.11-64.22 ref at the time so 1283,3/64.11=~20)

https://backpack.tf/item/12112740642

Dumped to a bot, nothing matches:

https://backpack.tf/profiles/76561198011422220#!/compare/1700956800/1706745600

https://backpack.tf/profiles/76561199059160806#!/compare/1706659200/1706745600

https://marketplace.tf/items/tf2/31233;5;u3118

https://backpack.tf/item/13254696289

December 12: $36/1.736=20.74 ~21 keys

December 30: $39.99/1.706=23.44 ~23 keys

February 16: $39.99/1.704=23,47 ~23 keys

key prices https://marketplace.tf/items/tf2/5021;6

12/12: (1.74+1.74+1.73+1.73+1.75+1.73+1.73)/7=1.736

30/12: (1.7+1.68+1.68+1.68+1.74+1.74+1.72)/7=1.706

16/02: (1.71+1.71+1.71+1.7+1.7+1.7+1.7)/7=1.704

Taking 19-23 keys here