What stickers have special “scratched” patterns

The 'Exceedingly Rare Special Items' are the different knife models. Knives unboxed can come in either a normal version or also have the chance of coming with StatTrak.

From Steam News:

Weapon Cases have a chance to contain new knives and StatTrak weapons, which track all player kills with that weapon.

The different knives that can be unboxed are:

• Bayonet
• M9 Bayonet
• Gut Knife
• Flip Knife
• Karambit
• Huntsman Knife
• Butterfly Knife
• Falchion Knife

The ★ symbol is the CS:GO version of Unusual. Knives unboxed will have the following name:

★ KNIFE_TYPE | PATTERN

So if you unboxed a Flip Knife Night, you would see:

★ FLIP KNIFE | NIGHT

For item drops, it boils down to 3 categories:

1. Weapons
   • Individual skins that drop are parts of certain Collections
     • A year ago-ish several of the original weapon collection skins were retired, meaning you cannot receive them as a drop from the item-drop system
     • Collections that you can currently receive item-drops from
       • The Train Collection
       • The Mirage Collection
       • The Safehouse Collection
       • The Italy Collection
       • The Lake Collection
       • The Dust II Collection
       • The Bank Collection
   • Weapons originating from Cases cannot be found as a drop
   • StatTrak weapons cannot be found as a drop
2. Cases & Capsules
   • There are always 3-5 cases in rotation in the item drop system
   • As new cases come in, old cases are phased out.
   • Some cases are for Operation pass-holders
     • For instance, the current operation is called Operation Breakout, with a case called Operation Breakout Case
     • This means that the Operation Breakout Case will drop for only for Operation Breakout pass holders
   • Older Operation drops are available to anyone, but this usually up to Valve's discretion
     • The previous Operation, Operation Phoenix, had it's own case specific for its own passholders, called the Operation Phoenix Case
     • The Operation Phoenix case used to be only for passholders, but can now be received as an item drop by anyone
   • Sticker Capsules can drop
   • Exclusive Sticker Capsules cannot drop. For example, the Katowice 2014 Challengers capsule (had to be bought in-game)
3. Missions
   • This was introduced in Operation Breakout
   • Missions WILL not drop for players without the Operation Breakout Pass
   • Completing a mission will give you a weapon drop from 3 specific collections:
     • The Baggage Collection
     • The Overpass Collection
     • The Cobblestone Collection
     • This means the above 3 colletion weapons CANNOT be found through regular item-drop system