Version 2 of my previous suggestion, wanted to thank STEVE for his advice.

Sale 1

06-26-23 I bought an Aces High Burning Question for 20 keys. I got it for cheap since it was recently unboxed (06-18-23). Proof

Sale 2

06-30-23 one sold in the Steam Community Market (SCM) for 90 USD.

I'm from Chile so my currency is Chilean pesos (CLP), I was keeping track of this unusual to update it's price with a more accurate one:

○ 06-27-23 I took a screenshot of an Aces High Burning Question listed in the SCM for 72,729.29 CLP

○ 06-30-23 I took a screenshot of the hat being sold in the SCM for 72,139.66 CLP which is ~90 USD

The reason the price in CLP it's not the same, it's because currency exchange fluctuates everyday, the difference in CLP is 589.63 which is ~0.74 USD, so it's irrelevant.

Proof of the screenshots

To value sale 2, I decided to take the average price of keys in the SCM during 06-30-23. Using it's graph I got these 24 prices for each hour:

1. 12AM: 2.19 USD

2. 1AM: 2.19 USD

3. 2AM: 2.19 USD

4. 3AM: 2.18 USD

5. 4AM: 2.19 USD

6. 5AM: 2.19 USD

7. 6AM: 2.19 USD

8. 7AM: 2.2 USD

9. 8AM: 2.19 USD

10. 9AM: 2.19 USD

11. 10AM: 2.19 USD

12. 11AM: 2.19 USD

13. 12PM: 2.19 USD

14. 1PM: 2.17 USD

15. 2PM: 2.17 USD

16. 3PM: 2.18 USD

17. 4PM: 2.18 USD

18. 5PM: 2.17 USD

19. 6PM: 2.18 USD

20. 7PM: 2.18 USD

21. 8PM: 2.18 USD

22. 9PM: 2.18 USD

23. 10PM: 2.17 USD

24. 11PM: 2.16 USD

The average key price on 06-30-23 was ~2.18 USD. Dividing 90 USD for that, would be ~41.3 keys, I'm truncating to 41.

New price suggestion

I thought a new price of 20-41 keys wouldn't work since the range difference is too much for this kind of unusual, that's why I'm not considering a low value of 20 but instead taking a flat price of 41 keys.

Let me know what you think, I would appreciate if you have more sales you could share with me to update it's low/high value.