Sale 1:

https://backpack.tf/profiles/76561198331398297#!/compare/1553731200/1553817600

https://backpack.tf/profiles/76561198065441328#!/compare/1553472000/1553904000

Gift?

Sale 2:

https://backpack.tf/profiles/76561198044335614#!/compare/1551139200/1551225600

https://backpack.tf/profiles/76561198185339862#!/compare/1551225600/1551312000

Sold for ~12 keys

Sale 3:

https://backpack.tf/profiles/76561198848985609#!/compare/1558137600/1558224000

https://backpack.tf/profiles/76561198091142935#!/compare/1558137600/1558224000

https://backpack.tf/profiles/76561198080185050#!/compare/1558051200/1558224000

https://backpack.tf/profiles/76561198305676157#!/compare/1558137600/1558224000

Gambling / QS

Sale 4:

https://backpack.tf/profiles/76561198100293442#!/compare/1552694400/1556323200

https://backpack.tf/profiles/76561198952429755#!/compare/1556323200/1557273600

https://backpack.tf/profiles/76561198294163807#!/compare/1556236800/1556323200

Scam / transfer

Sale 5:

https://backpack.tf/profiles/76561198294163807#!/compare/1556323200/1556496000

https://backpack.tf/profiles/76561198012168537#!/compare/1556236800/1556323200

https://backpack.tf/profiles/76561198012168537#!/compare/1556323200/1556409600

https://backpack.tf/profiles/76561198138926290#!/compare/1539907200/1557187200

Not unsual...

Sale 6:

https://backpack.tf/profiles/76561198138750273#!/compare/1555977600/1557187200

https://backpack.tf/profiles/76561198050052801#!/compare/1555977600/1556064000

Sold with 4 keys for SGG BaL

BaL Mini:

https://backpack.tf/suggestion/5ceb21216780725ce6492092

Suggestion for 10.5 keys

Total is 6.5 keys

Sale 7:

https://backpack.tf/profiles/76561198247576962#!/compare/1558656000/1558742400

https://backpack.tf/profiles/76561198044684270#!/compare/1558656000/1558742400

Sold for ~7 keys

Sale 8:

https://backpack.tf/profiles/76561198305676157#!/compare/1558051200/1558137600

https://backpack.tf/profiles/76561198303895632#!/compare/1557878400/1558137600

Sold for 9 keys

Sale 9:

https://backpack.tf/profiles/76561198303895632#!/compare/1558656000/1558742400

https://backpack.tf/profiles/76561198097271466#!/compare/1558656000/1558742400

Untrace

Sale 10:

https://backpack.tf/profiles/76561198073428292#!/compare/1554768000/1555113600

https://backpack.tf/profiles/76561198080179568#!/compare/1555027200/1555113600

Untrace

Sale 11:

https://backpack.tf/profiles/76561198232956880#!/compare/1553299200/1553385600

https://backpack.tf/profiles/76561198027152204#!/compare/1553385600/1558742400

https://backpack.tf/profiles/76561198394903250#!/compare/1553299200/1553385600

https://backpack.tf/profiles/76561198232956880#!/compare/1553299200/1553385600

https://backpack.tf/profiles/76561198087942099#!/compare/1553212800/1553472000

https://backpack.tf/profiles/76561198072898758#!/compare/1553299200/1553472000

https://backpack.tf/profiles/76561197992703391#!/compare/1553385600/1553472000

https://backpack.tf/profiles/76561198875470056#!/compare/1553126400/1553472000

https://backpack.tf/profiles/76561197961345984#!/compare/1553299200/1553472000

https://backpack.tf/profiles/76561198037674114#!/compare/1551571200/1554336000

Gambling?

Sale 12:

https://backpack.tf/profiles/76561198332839477#!/compare/1555027200/1555113600

https://backpack.tf/profiles/76561198158795399#!/compare/1555027200/1555113600

Sold for ~7 keys

Sale 13:

https://backpack.tf/profiles/76561198158795399#!/compare/1555027200/1555113600

https://backpack.tf/profiles/76561198137838908#!/compare/1555027200/1555113600

Untrace

Sale 14:

https://backpack.tf/profiles/76561198137838908#!/compare/1555027200/1555113600

https://backpack.tf/profiles/76561198002757046#!/compare/1555027200/1555113600

Sold for 7 keys

Sale 15:

https://backpack.tf/item/6069133560

all gambling, then QS

Sale 16:

https://backpack.tf/profiles/76561198114329180#!/compare/1553990400/1556323200

https://backpack.tf/profiles/76561198059921781#!/compare/1548892800/1556755200

https://backpack.tf/profiles/76561198059921781#!/compare/1556928000/1557014400

https://backpack.tf/profiles/76561198027152204#!/compare/1557100800/1557187200

https://backpack.tf/profiles/76561198870410287#!/compare/1557100800/1557187200

https://backpack.tf/profiles/76561197984373540#!/compare/1557187200/1557273600

https://backpack.tf/profiles/76561198240537922#!/compare/1557187200/1557273600

https://backpack.tf/profiles/76561198870410287#!/compare/1557187200/1557273600

https://backpack.tf/profiles/76561198240537922#!/compare/1557273600/1557360000

https://backpack.tf/profiles/76561198870410287#!/compare/1557273600/1557360000

https://backpack.tf/profiles/76561198112099979#!/compare/1557273600/1557360000

https://backpack.tf/profiles/76561198030383222#!/compare/1557273600/1557360000

https://backpack.tf/profiles/76561198074718149#!/compare/1557273600/1557360000

https://backpack.tf/profiles/76561198027152204#!/compare/1557273600/1557360000

https://backpack.tf/profiles/76561198172644665#!/compare/1557273600/1557360000

https://backpack.tf/profiles/76561198081793950#!/compare/1557100800/1557446400

https://backpack.tf/profiles/76561198033661509#!/compare/1557360000/1557446400

https://backpack.tf/profiles/76561198033661509#!/compare/1557360000/1557446400

https://backpack.tf/profiles/76561198086355525#!/compare/1557446400/1557532800

https://backpack.tf/profiles/76561198053720151#!/compare/1557532800/1557619200

https://backpack.tf/profiles/76561198090147535#!/compare/1557532800/1557619200

https://backpack.tf/profiles/76561198090147535#!/compare/1558224000/1558310400

https://backpack.tf/profiles/76561198203029494#!/compare/1558224000/1558310400

https://backpack.tf/profiles/76561198203029494#!/compare/1558137600/1558224000

https://backpack.tf/profiles/76561198354126747#!/compare/1558137600/1558224000

https://backpack.tf/profiles/76561198181549634#!/compare/1558310400/1558396800

https://backpack.tf/profiles/76561198029514444#!/compare/1558310400/1558396800

gambling / untrace / bulk

Sale 17, 18:

https://marketplace.tf/items/30621;5;u3006

$13.00 / $1.8 = 7.22 keys

$12.85 / $1.8 = 7.14 keys

Bot.tf:

https://bot.tf/stats/item?def=30621&q=5&ef=Screaming%20Tiger&craft=1&aus=0&ks=0

1 @ 9 keys

1 @ 8 keys, 18.00 ref

1 @ 7 keys, 10.00 ref

Total sales @:

6.5, 7, 7, 7, 7.14, 7.21, 7.22, 8.38, 9, 12 keys

Non strange buyers at 5 keys, hidden non strange buyer for 7.36 keys.

unsolds at 8.76, 9 keys,

sellers at ~7.5, 8 keys.

one buyer shouldn't counter multiple low sales,

taking 6.5 - 8.5, calling 9, 12 high based on sellers.