Suggestion: Strange Normal Sniper Rifle at 330–500 keys

Sale 7) Sold for $200 (~118 Keys) + MW Energy Orb Night Owl Sniper (95 Keys) + Mallard Noble (44.5 Keys) + Haunted Ghosts Trophy (39.5 Keys) + Spec KS Max's (37 Keys) + Pro KS Aussie Sniper (~32 Keys) + Strange Pro KS Sniper (~10 Keys) + Smoking Head Hedge (9.5 Keys)

https://backpack.tf/profiles/76561198146579306#!/compare/1558051200/1558137600

https://backpack.tf/profiles/76561198001256381#!/compare/1558137600/1558224000

https://gyazo.com/da34289c7f5eb4e1939ce3fea715a7a7 - Thanks, vohh

https://imgur.com/a/FpNBcp6 - Thanks, vohh

118 + 95 + 44.5 + 39.5 + 37 + 32 + 10 + 9.5 = 385.5, which I'll round to 385 Keys

Noble Mini

https://backpack.tf/suggestion/5d4b94a1d38172201359c701 - 44.5 Keys

Trophy Belt Mini

https://backpack.tf/profiles/76561198346897149#!/compare/1564531200/1564617600 - Sold for 39 Keys

https://backpack.tf/profiles/76561198305494036#!/compare/1560902400/1560988800 - Sold for 40 Keys + 5 Refined

Max's Mini

https://backpack.tf/profiles/76561198146579306#!/compare/1558310400/1558396800 - Sold for 37 Keys

https://backpack.tf/suggestion/5d4e7c7d6780724d3f29107b - Forgot to link the Veil Mini; 600 Keys here

New sales

https://backpack.tf/profiles/76561198146579306#!/compare/1562025600/1562284800 - Yellow was traded back..

https://backpack.tf/profiles/76561198146579306#!/compare/1562284800/1562544000 - Spellbound Bonnet + Awp + Keys

https://backpack.tf/profiles/76561198134512931#!/compare/1568851200/1568937600 + https://backpack.tf/profiles/76561198146579306#!/compare/1568851200/1568937600 - Bulky

https://backpack.tf/profiles/76561198027338258#!/compare/1569196800/1569369600 - Duped Buds + GE Cone + Robo Lid (68)

https://backpack.tf/profiles/76561198075551260#!/compare/1568764800/1568851200 - With Flames Masters Belt for Duped Scorching Veil

For the Spellbound Bonnet,

https://backpack.tf/profiles/76561198084126218#!/compare/1565395200/1565740800 - 68 + PS Bonnet + EOF Liquidator's (24 Keys) + Broom

https://imgur.com/a/RjPTCgQ - Buyout of 195 Keys

For the Shadows Bonnet,

https://backpack.tf/profiles/76561198151087213#!/compare/1566000000/1566086400 - Shadows Strontium + Strange Logo Rotation + Max's

https://imgur.com/a/NeJDnLR - Buyout of 115 Keys

Can't find any special sales for the Spelled AWP, so I'll take the ~15 Keys that the Classifieds are at -> https://imgur.com/a/I9q7R5t

That puts the Bonnet/AWP/Keys sale at 260 Keys

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For the Duped Buds,

https://marketplace.tf/items/tf2/143;3 - Sales at 207 Keys, 154 Keys (low), and 192 Keys

https://imgur.com/a/yn3JD7c - Sellers ~220 Keys and Buyers ~150 Keys

https://backpack.tf/item/280092096

https://backpack.tf/u/76561198146579306

https://backpack.tf/u/76561198168863803

For the GE HKC

https://marketplace.tf/items/tf2/30177;5;u9 - 2 Sales at $295.50 (~160 Keys)

https://backpack.tf/profiles/76561198069286674#!/compare/1567900800/1567987200 - Burning Frag-Proof Fragger

https://backpack.tf/profiles/76561198058977676#!/compare/1563148800/1563235200 - Burning Coldfront + 40 Keys

https://backpack.tf/profiles/76561198058977676#!/compare/1563494400/1563667200 - ~115 Keys of Unusuals + 35 Keys

That makes the Buds/Cone/Lid sale fit in the range.