Item 1: https://backpack.tf/item/11076732294

Sale 1:

https://backpack.tf/profiles/76561198135483308#!/compare/1765152000/1765238400

https://backpack.tf/profiles/76561198107182368#!/compare/1765152000/1765324800

Sold alongside the Eldritch Rift Homerunner's Hobby and 1 key for the Aurora Borealis Homerunner's Hobby and Aurora Borealis Boston Boarder (bulk)

Sale 2:

https://backpack.tf/profiles/76561198107182368#!/compare/1767052800/1767744000

https://backpack.tf/profiles/76561198152041450#!/compare/1767312000/1767657600

6 keys

Items 2 and 3: https://backpack.tf/item/9592166606 https://backpack.tf/item/11111699601

Both listed on MPTF

Sales:

6

Sellers:

BPTF - https://imgur.com/4Kjz1ui MPTF seller with a buyout of 6 keys

MPTF - https://marketplace.tf/items/tf2/31156;5;u3087 $11.99 (~6.5 keys but one of them is capped at 6 keys)

STN - https://stntrading.eu/item/tf2/Unusual+Sublime+Snowstorm+Taunt%3A+The+Boston+Boarder none

SCM - https://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20The%20Boston%20Boarder?filter=Sublime+Snowstorm https://imgur.com/uJqLCtP none

Going with 6 keys