Only two moved in-date:

Item 1:

https://backpack.tf/item/12054104977

Sale 1: 5/22, 64 keys pure (ID: 15760190327), leaving buyer inv side, can see history going to seller

https://backpack.tf/profiles/76561198239865868#!/compare/1730505600/1747872000

https://backpack.tf/profiles/76561199235704407#!/compare/1747785600/1747872000

In-date movement between Fox and Loz seems to be bot withdrawal.

Sale 2: Dump to Quicksell.store bot, keys are untraceable on both sides

https://backpack.tf/profiles/76561199183171982#!/compare/1747872000/1747958400

https://backpack.tf/profiles/76561199111073161#!/compare/1747872000/1747958400

Item 2 (Not included in the range but info):

https://backpack.tf/item/11665257607

Sale 1: 4/16, 86 keys pure, can see them on Lauren's side, coming from pancake

https://backpack.tf/profiles/76561198252370220#!/compare/1642291200/1744761600

https://backpack.tf/profiles/76561198261483133#!/compare/1744675200/1744761600

This sale is in-date, but the market has moved down, current sell orders at 65.5 keys, so excluding this from the range.

Sell orders for the Severed Serration Blami on 6/13: https://imgur.com/a/9lTO9HX

Only in-date sale is for 64 keys, so taking 64 keys.