Sale 1:

https://backpack.tf/profiles/76561198129716116#!/compare/1552262400/1552348800

Traded with Screaming Tiger Taunt: Most Wanted for Isotope Cardboard Boxed Rocket Launcher (Field-Tested)

The Rocket Launcher is in-date at ~26 keys.

https://backpack.tf/suggestion/5cb2cd656780723b5717d227

The Most Wanted Taunt is in-date at 4 keys.

This makes the Sniper Rifle 22 keys.

Sale 2:

https://backpack.tf/profiles/76561198129716116#!/compare/1551916800/1552262400

Sold for Orbiting Planets Brotherhood of Arms (in-date at 30 keys)

https://backpack.tf/suggestion/5c778111d38172447b431bc4

Sale 3:

https://backpack.tf/profiles/76561198131469626#!/compare/1549497600/1549584000

https://backpack.tf/profiles/76561198307037169#!/compare/1549497600/1549584000

Sold for Starstorm Insomnia Towering Pillar of Hats (in-date at 25 keys)

https://backpack.tf/suggestion/5cbbeb5bd381726a812fbac4

I don't know why it's untradeable in that one link, but histories match. *shrug*

Sale 4:

https://marketplace.tf/items/201;15;u701;w4;pk203/

Sold on March 3, 2019 for $75.00 / 1.79 = 42 keys

Sale 5:

https://backpack.tf/profiles/76561198073438708#!/compare/1549584000/1549670400

Untraceable

Conclusion: Going with 25-30 after a series of resuggestions, minis, and fixes. Thank you Mindacos for help in the past two suggestions.

https://backpack.tf/suggestion/5cbbeb5bd381726a812fbac4

https://backpack.tf/suggestion/5c909e4fd381726c9f2bb30b