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Updating my first suggestion with more information provided by Rainy.
For the high value I considered the sales stat from https://marketplace.tf/items/tf2/31262;5;u224 since march 2023, for key prices in USD I'm using the median price found at https://marketplace.tf/items/tf2/5021;6 of the same day the hat was sold.
1. 03/02/2023: 1 sold at martketplace.tf for 31.99 USD, key was 2.05 USD ~ 15.6 keys
2. 03/15/2023: 1 sold at martketplace.tf for 31.99 USD, key was 2.03 USD ~ 15.76 keys
3. 03/24/2023: 1 sold at martketplace.tf for 31.99 USD, key was 2.1 USD ~ 15.23 keys
4. 04/07/2023: 1 sold at martketplace.tf for 31.99 USD, key was 2.1 USD ~ 15.23 keys
5. 04/11/2023: 1 sold at martketplace.tf for 31.99 USD, key was 2.08 USD ~ 15.38 keys
Decided to round up the high value to 16 keys, considering the scenario you would take a key as 2 USD. Also the most expensive sell listing of this hat currently is for that amount: https://backpack.tf/classifieds?item=Undercover%20Brolly&quality=5&tradable=1&craftable=1&australium=-1&particle=224&killstreak_tier=0
For the low value Rainy shared the sales statistics from Gladiator https://gladiator.tf/sales?item=Crustacean%20Sensation%20Undercover%20Brolly&at=2023-04-14T05:20:47.913Z where 4 were sold for 11 keys in the past 30 days. Screenshot: https://imgur.com/a/8NiLhrW
04/13/2023 I bought one for 13 keys from a listing from this site. Screenshots: https://imgur.com/a/S2xgWWh, https://imgur.com/a/5Jl1Lwd
PS. English is not my first language, sorry for my grammar.
https://gladiator.tf/time-machine?item=Crustacean%20Sensation%20Undercover%20Brolly&at=2023-05-03T08:35:18.000Z
https://backpack.tf/profiles/76561198055480432#!/compare/1682985600/1683072000
https://backpack.tf/profiles/76561199132184792#!/compare/1682985600/1683072000 - sold for 10 keys (was to a buy-order)
should be fine to exclude this