Worth a shot.

Recycling some info from the previous suggestion.

Sale 1: Sold for 600 keys

Item history - https://backpack.tf/item/4327897292

Seller - https://backpack.tf/profiles/76561197994153262#!/compare/1599609600/1618272000

Buyer - https://backpack.tf/profiles/76561198258937500#!/compare/1618185600/1618272000

Screenshot of trade - https://imgur.com/gallery/LY3oquo

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Sale 2: 1150 keys, spread across two trades. 300 key down payment, 850 key second payment

First trade was 300 keys on April 19th.

Compare link- https://backpack.tf/profiles/76561198104146629#!/compare/1618704000/1618790400

Screenshots of initial agreement + first trade - https://imgur.com/a/0MVfLb7

Second trade was 850 keys and includes the Rifle:

Seller - https://backpack.tf/profiles/76561198258937500#!/compare/1619222400/1619308800

Buyer - https://backpack.tf/profiles/76561198104146629#!/compare/1619222400/1619308800

Inventory history screenshot - https://imgur.com/a/C31YBbW

If anything else is needed for proof, I'll provide, but I'm not a hundred percent sure this sugg is clean enough given the massive range between sales. 600 is low for the Rifle as it is but that can be argued against.