Sale 1:

https://backpack.tf/profiles/76561198077555267#!/compare/1583020800/1583107200

https://backpack.tf/profiles/76561198341411993#!/compare/1583020800/1583107200

sold for ~6 keys in sweets + spell

https://bot.tf/stats/listings/Y8E51NQN

B/O of 20 keys

sale 2:

https://backpack.tf/profiles/76561198341411993#!/compare/1585612800/1585872000

https://backpack.tf/profiles/76561197982127154#!/compare/1585785600/1585872000

Sold for ~8.5 keys in sweets

https://bot.tf/stats/listings/4RG9R9VD

B/O of 18 keys

sale 3:

https://backpack.tf/profiles/76561197982127154#!/compare/1586390400/1586563200

https://backpack.tf/profiles/76561198059248968#!/compare/1586476800/1586563200

Bulk

sale 4:

https://backpack.tf/profiles/76561198059248968#!/compare/1586563200/1586736000

https://backpack.tf/profiles/76561198061779536#!/compare/1586649600/1586736000

Bulk

sale 5:

https://backpack.tf/profiles/76561198061779536#!/compare/1587081600/1587168000

https://backpack.tf/profiles/76561198838788284#!/compare/1587081600/1587168000

Sold for 7 keys

sale 6:

https://backpack.tf/profiles/76561198838788284#!/compare/1587427200/1587513600

https://backpack.tf/profiles/76561198382763252#!/compare/1587427200/1587513600

Can trace ~4 keys in sweets

sale 7:

https://backpack.tf/profiles/76561198382763252#!/compare/1587513600/1587600000

https://backpack.tf/profiles/76561198183625771#!/compare/1587513600/1587600000

Sold with negligible sweets for Snowblind Spiky + 1 key

Spiky Mini:

https://backpack.tf/suggestion/5ea6f9001b58745bfb5e542b

Suggestion for 13 keys

Total is 14 keys

https://bot.tf/stats/listings/4661P612

B/O of 17 keys

Sale 8:

https://backpack.tf/profiles/76561198183625771#!/compare/1587686400/1587772800

https://backpack.tf/profiles/76561198026198026#!/compare/1587686400/1587859200

Sold with negligible sweets for Stormy Connoisseur

use there

https://bot.tf/stats/listings/M19XQVV1

B/O of 15 keys

Sale 9:

https://backpack.tf/profiles/76561198122604075#!/compare/1580860800/1581120000

https://backpack.tf/profiles/76561198419855386#!/compare/1580947200/1581033600

https://backpack.tf/profiles/76561198419855386#!/compare/1581292800/1581379200

https://backpack.tf/profiles/76561198122604075#!/compare/1581292800/1581379200

Untrace / bulk

sale 10:

https://backpack.tf/profiles/76561198122604075#!/compare/1581724800/1581811200

https://backpack.tf/profiles/76561198313292803#!/compare/1581638400/1581811200

Sold for Aussie Knife(~16)

Sale 11:

https://backpack.tf/profiles/76561198285638849#!/compare/1584576000/1584662400

https://backpack.tf/profiles/76561198089253101#!/compare/1584576000/1584662400

https://backpack.tf/profiles/76561198123181909#!/compare/1584576000/1584921600

Untrace

sale 12:

https://marketplace.tf/items/tf2/30671;5;u3023

$27 / $1.77 = 15.25 keys

https://backpack.tf/item/4467048926

Total sales @:

7, 8.5, 14, 15, 16 keys

sellers down to 16 keys,

buyers up to 5 keys,

taking 9 - 15 keys.