"Sale 1" how do you know it's untrace? You haven't supplied any compare links for it.

Sale 1 is actually:

https://backpack.tf/profiles/76561198164651434#!/compare/1605916800/1606003200

https://backpack.tf/profiles/76561198879412409#!/compare/1605916800/1606003200 - Sold with a Kaleidoscope California Cap + a Professional Killstreak Big Kill + a Wandering Wisps Hazard Headgear + a Strange Professional Killstreak Australium Flame Thrower for 110 keys. Bulk

Additional sales you have made no effort in finding.

https://backpack.tf/profiles/76561198060035281#!/compare/1605916800/1606003200

https://backpack.tf/profiles/76561198879412409#!/compare/1605916800/1606003200 - Bulk, sold with similar items as Sale 1, for a Stormy 13th Hour Surgeon's Stahlhelm

https://backpack.tf/profiles/76561198067189335#!/compare/1602028800/1602460800 - Bulk

https://backpack.tf/profiles/76561199070258736#!/compare/1602547200/1602633600 - Sold for 19 keys, 21 ref

https://backpack.tf/profiles/76561198138335400#!/compare/1602633600/1602720000 - Sold for 19 keys

https://backpack.tf/profiles/76561198322957656#!/compare/1602892800/1602979200 - Sold for an Accursed Shred Alert - Might be low here given it has a seller at 14 keys and sales ~17 keys - https://marketplace.tf/items/tf2/1015;5;u3024

https://backpack.tf/profiles/76561198149821826#!/compare/1602979200/1603065600

https://backpack.tf/profiles/76561198337734785#!/compare/1602892800/1602979200 - Buy order, supports 19 keys

https://backpack.tf/profiles/76561198140709978#!/compare/1602633600/1602720000

https://backpack.tf/profiles/76561199029568303#!/compare/1602633600/1602720000 - Buy order, 9 keys match but this was more likely 19 keys

https://backpack.tf/profiles/76561199085116273#!/compare/1605830400/1605916800

https://backpack.tf/profiles/76561199029568303#!/compare/1605398400/1605657600 - Untrace, probably sold to someone inbetween

https://backpack.tf/item/7427192766 - History that was missed, no valid sale from it however. Only:

https://backpack.tf/profiles/76561198144748780#!/compare/1602633600/1605657600 - Untrace

Considering the 22 sale took 11 months - https://backpack.tf/item/7037934108 - and the buyer resold to a Quickbuyer 2 weeks after buying it, likely for ~19 keys, I would exclude 22 here.

Sale 2's other side - https://backpack.tf/profiles/76561198337734785#!/compare/1605139200/1605225600 - shows that it was 20 keys and 16 ref (not 30, some ref was used on Cute suit and sore eyes)

If it was 20 keys 30 ref it would've rounded to 21 keys since 30 ref was >0.5 keys at the time

There's a couple sale I've found at 19 keys, which are supported, so I would range this 19 - 20 keys.