The two on Marketplace sold (for different amounts) and now I can finally price this thing (properly), splendid.

Item 1: https://backpack.tf/item/15004415626

Sale 1: Marketplace sale (below)

Item 2 was also a marketplace sale, but can't find the item history.

Marketplace sales:

https://marketplace.tf/items/tf2/1115;5;u3176

Two sold, one for $27.99 and one for $31.99, both Jan 4th (Thank you Blaze)

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

Key price for the day is $1.85

$27.99/$1.85 = 15.13k

$31.99/$1.85 = 17.29k

Classifieds link (1/15): https://imgur.com/a/GQqtzVj

Two sales, one at 15.13k and one at 17.29k, rounding down 15.13k to 15k for our low end and 17.29k to 17k for our high end.