... weird of you to cherry pick examples for prices.

Here are the hats and item histories that you would need to find sales for because they are all valid in order to make a proper suggestion:

Burning Flames Tundra Top (could argue that the last suggestion might have been in range during the sale, but still)

https://backpack.tf/stats/Unusual/Tundra%20Top/Tradable/Craftable/13

1 - https://backpack.tf/item/6740369954

2 - https://backpack.tf/item/9286444511

3 - https://backpack.tf/item/9234986891

4 - https://backpack.tf/item/7730619725

5 - https://backpack.tf/item/7156895231

Frostbite Crocleather Slouch

https://backpack.tf/stats/Unusual/Crocleather%20Slouch/Tradable/Craftable/87

1 - https://backpack.tf/item/8464290420

2 - https://backpack.tf/item/4081660868

3 - https://backpack.tf/item/3307298470

4 - https://backpack.tf/item/13201090469

(also love the quick maths at the bottom)

https://imgur.com/a/CTPf0HB