To search for Unusual weapons, when you click the Premium Search button, you actually have to... click through filters *shudders*

https://gyazo.com/e64e2fb1cead40adb4fe669c9fa3803a

From here, Build a Search

https://gyazo.com/a4638c1c8299a0e74448ef1e7be173e2

Then specify the item you want (spelling and capitalization must be correct, splattergun / cocket launcher won't cut it)

https://gyazo.com/e41aa6c7cfa219fe9e48593cf77d5f32

Then specify the skin you want (spelling and capitalization must be correct, Totally Boner won't cut it)

https://gyazo.com/1ce416f1014297be780ef196fa67a47c

Then specify the effect - You can also change this through the url at the top (Hot 701, Isotope 702, Cool 703, Energy Orb 704 - So you don't have to scour this big dumb list)

https://gyazo.com/67cd6ec9209041b5d05ecbdc1290a2ca

If you get the skin name wrong, then you just get every skin that matches the other specifications (Sniper Rifle, Cool in this case)

Unusual skins according to backpack.tf have five different qualities, at least what you can change through the URL or through filters:

Decorated Weapon - White background with no/purple border associated with most skins - https://backpack.tf/item/7499765788

Strange Decorated - The white background with an orange background to indicate the item is strange - https://backpack.tf/item/5179716324

Strange - Full orange background like a regular Strange item, but it's a skin (mostly comes from war paints) - https://backpack.tf/item/7979025920

Unusual - Full purple background like a regular Unusual item, but it's a skin (mostly comes from old OG skins that backpacktf couldn't fix?) - https://backpack.tf/item/4928520713

Strange Unusual - Purple background with an orange border like the Strange Unusual items (again from some old OG skins) - https://backpack.tf/item/4060641091

https://gyazo.com/7c8311af7817c0e1056d476721f24ba7

Removing the Quality search from the filter altogether will find you all possible weapons of that skin, since they come in different qualities.

https://gyazo.com/ea05e773259408d72f3e70968b60e2a8

Skins move through SCM sometimes, so sometimes they become untradeable, removing the Tradable filter will find you even more skins

Although some items are untradable because of other things, like unboxing an untradable skin because key/crate untradable, permanently untradable like applying an untradable killstreak kit, etc.

That's pretty much it.

No wonder I'm the only one who does weapon suggestions.