5 sales

Sale #1: sold on 8/29 for 75 pure

https://backpack.tf/profiles/76561198129911892#!/compare/1693267200/1693353600

Sale #2: sold on 8/18 for 50 pure

https://i.imgur.com/M1WtcFh.jpg

Sale #3: sold on 8/12 for 50 pure

https://imgur.com/a/GwBDrpU

Sale #4: sold on 8/17 for 50 pure

https://imgur.io/NxyPVuQ

Sale #5: sold on 8/18 for: Burning Elf Esteem (35K), Strange Prof KS Scotsman (3.5K), Strange Flamethrower w/ Halloween Fire(Seller @17, Buyer @12, meeting at 14.5K), Max’s Severed Head (24K), The Head Prize (5K), Vintage Lugermorph (12K), and (4) Squad Surplus Voucher (4K)

https://backpack.tf/profiles/76561199365584645#!/compare/1692230400/1692835200

https://imgur.com/UPKvTf9

Mini for Burning Flames Elf Esteem

Sale 1: Sold on MP TF for $69.99 on July 14th, 2023. Keys at the time were $1.98, therefore 69.99/1.98=35.34 keys, rounding to 35.

Other sales are untraceable from comparison histories and currently no responses yet from recent traders.

Adding everything is a sum of 93K of mixed items

Feeling the Mini may have been an outlier, a range of 50-75 keys seems plausible, however it can be argued 75 keys may also be an outlier due to the more quantity of sales at 50. One more thing to add though, the most recent recorded sale was the 75K trade, so it may not be as far fetched. For now, 50-75 will be my verdict.

Will continue updating the suggestion and the mini if more information pops in.

Many thanks to [TGP] Crust and NGNear for providing screenshots.