Sale 1:

https://backpack.tf/profiles/76561198072046829#!/compare/1581465600/1581552000

https://backpack.tf/profiles/76561198066369838#!/compare/1581465600/1581552000

Sold with ~2 keys in sweets for TW Hong Kong

Kong Mini:

https://backpack.tf/suggestion/5ebb5da9e1a09d71a46ac3c5

Suggestion for 30 keys

Total is 28 keys

https://bot.tf/stats/listings/MXQJW23P

B/O of 32 keys

sale 2:

https://backpack.tf/profiles/76561198066369838#!/compare/1581552000/1581638400

https://backpack.tf/profiles/76561198125791160#!/compare/1581552000/1581638400

QS

sale 3:

https://backpack.tf/profiles/76561198125791160#!/compare/1587081600/1587168000

https://backpack.tf/profiles/76561198125156815#!/compare/1586995200/1587513600

Sold for 30 keys

sale 4:

https://backpack.tf/profiles/76561198126679929#!/compare/1588723200/1588896000

https://backpack.tf/profiles/76561198001953338#!/compare/1586304000/1588809600

Bulk / untrace

sale 5:

https://marketplace.tf/items/tf2/1115;5;u3021

$44.99 / $1.77 = 25.42 keys

$54.99 / $1.88 = 29.25 keys <--- https://backpack.tf/item/4382575365

$54.99 / $1.89 = 29.10 keys

$59.00 / $1.90 = 31.05 keys

Total sales @:

25, 28, 29, 29, 30, 31 keys

calling 25 the outlier,

taking 28 - 31 keys