History 1: https://backpack.tf/item/6300929689

Untraceable:

https://backpack.tf/profiles/76561199102407070#!/compare/1620950400/1621036800

https://backpack.tf/profiles/76561198271629958#!/compare/1620518400/1621036800

History 2: https://backpack.tf/item/7364688969

Marketplace.tf seller at ~8.83 keys https://marketplace.tf/items/tf2/1183;5;u3050

History 3: https://backpack.tf/item/6512599997

Mannco.Store sale

History 4: https://backpack.tf/item/6493776921

4 keys:

https://backpack.tf/profiles/76561198142624320#!/compare/1624492800/1625011200

https://backpack.tf/profiles/76561197961216583#!/compare/1624665600/1624752000

History 5: https://backpack.tf/item/6319638146

Untraceable:

https://backpack.tf/profiles/76561198817088867#!/compare/1626739200/1626998400

https://backpack.tf/profiles/76561199113899944#!/compare/1626912000/1626998400

Looks like bulk:

https://backpack.tf/profiles/76561199113899944#!/compare/1626912000/1626998400

https://backpack.tf/profiles/76561198093501381#!/compare/1626912000/1626998400

https://mannco.store/item/440-frosted-star-unusual-taunt-yeti-smash

June 6: $9.47/1.75=5.41 ~5.4

June 29: $7.37/1.68=4.39 keys ~4.4 keys

July 2: $9.21/1.7=5.42 ~5.4 keys

Only 1 buyer at 4 keys as of now; also was definitely not low at the time of the sale https://gladiator.tf/listings/60d3bf03463f5fee599ae6fd

Taking 4-5.4 keys here (mean is 4.71 which is below 5 so rounding both ends to the nearest 0.05)