Item 1

https://backpack.tf/item/12221164109

Sale 1

Looks like 20 keys + 30 ref from seller's compare, given seller's compare is very clean, taking as ~20 keys

Seller: https://backpack.tf/profiles/76561198310051697#!/compare/1708732800/1708819200

Buyer: https://backpack.tf/profiles/76561198099066988#!/compare/1646092800/1709596800

Item 2

https://backpack.tf/item/10187780518

Sale 2

Looks like 20 keys + 15 ref from seller's compare, seller's compare is very clean so taking as ~20 keys

Seller: https://backpack.tf/profiles/76561198396959351#!/compare/1705708800/1705795200

Buyer: https://backpack.tf/profiles/76561198423280431#!/compare/1705708800/1705795200

Sale 3

18 keys + 47 ref from seller's compare, key histories match. Sale is ~19 keys

Seller: https://backpack.tf/profiles/76561198423280431#!/compare/1705795200/1705968000

Buyer: https://backpack.tf/profiles/76561198142120893#!/compare/1705968000/1706054400

Sale 4

From ID 14101146974, seller added 5 keys for a Non-Craftable Summer Hat (~24.3). 24.3 - 5 = ~19 keys (supports previous sales)

Seller: https://backpack.tf/profiles/76561198142120893#!/compare/1706313600/1706400000

Buyer: https://backpack.tf/profiles/76561198118776341#!/compare/1706313600/1706400000

Sale 5

17 keys cleanly shows in seller's compare

Seller: https://backpack.tf/profiles/76561198118776341#!/compare/1707004800/1707264000

Buyer: https://backpack.tf/profiles/76561198203701884#!/compare/1707004800/1707091200

Sale 6

Seems like the buyer dumped to STN for 17 keys + 49 ref = ~18 keys, ID matches 14140598369

Seller: https://backpack.tf/profiles/76561198118776341#!/compare/1707004800/1707264000

Buyer: https://backpack.tf/profiles/76561198311498888#!/compare/1707264000/1707350400

No recent Marketplace sales

https://marketplace.tf/items/tf2/30099;5;u35

Sales

17

18

19

19

20

20

Classies: https://gyazo.com/393df1a71c81b09c497354e66a26674e

https://stntrading.eu/item/tf2/Unusual+Smoking+Pardner%27s+Pompadour

https://gyazo.com/72cde8d2adf3f79fdaab877635774b4a

https://backpack.tf/item/10187780518 - One listed on STN at ~19.55 keys

For Item 2, 20 -> 19 -> 19 -> 17 -> 18, and is now listed at ~20. Even if we exclude 20 and 19 for being resold for lower, Sale 1 still supports including 20 in range. All sales were also very similar in value (1-2 key gap at most between sales). So, electing to take a range with all sales at 17 - 20 keys.