https://backpack.tf/profiles/76561198082401774#!/compare/1634169600/1634428800 - Don't know

https://backpack.tf/profiles/76561198031791060#!/compare/1634169600/1634342400 - SCM sale for something

https://backpack.tf/profiles/76561198114690036#!/compare/1634688000/1634774400 - ?

https://backpack.tf/profiles/76561198204215085#!/compare/1634947200/1635033600 - Quicksold for 75 Keys

https://backpack.tf/profiles/76561198093501381#!/compare/1636848000/1636934400 - ?

https://backpack.tf/profiles/76561197982127154#!/compare/1636329600/1636416000 - ?

https://backpack.tf/profiles/76561199110917829#!/compare/1637971200/1638057600 - 75 Keys

70 to 75 would work here.

For future reference, to get these compare links, click the "Last Seen" date next to a person in an item's history, click the compare button, and make the 2 dates the "Last Seen" date and one date before or after, whichever shows the item leaving.

There's a guide on the Forums that can prove useful - https://forums.backpack.tf/topic/59832-guide-how-to-use-the-compare-function/