Hi everyone, thanks to SneakY, I've updated the list of skins (Unique souvenir Skins) that qualify for people who want to join this group. The number next to the "#" represents the number of copies :

#1 Souvenir M4A1-S | Nitro (Factory New)
#1 Souvenir Desert Eagle | Mudder (Factory New)
#1 Souvenir AWP | Pit Viper (Battle-Scarred)
#1 Souvenir MP9 | Orange Peel (Factory New)
#1 Souvenir Dual Berettas | Cobalt Quartz (Well-Worn)
#1 Souvenir P2000 | Granite Marbleized (Factory New)
#1 Souvenir AUG | Condemned (Factory New)
#2 Souvenir Five-SeveN | Silver Quartz (Well-Worn)
#2 Souvenir Tec-9 | Nuclear Threat (Factory New)
#2 Souvenir P250 | Nuclear Threat (Factory New)
#2 Souvenir USP-S | Forest Leaves (Factory New)
#2 Souvenir Sawed-Off | Full Stop (Well-Worn)
#3 Souvenir AWP | Dragon Lore (Well-Worn)
#3 Souvenir AWP | Pit Viper (Well-Worn)
#3 Souvenir M4A1-S | Boreal Forest (Factory New)
#3 Souvenir UMP-45 | Gunsmoke (Factory New)
#3 Souvenir FAMAS | Cyanospatter (Factory New)
#4 Souvenir R8 Revolver | Bone Mask (Minimal Wear)
#4 Souvenir AWP | Safari Mesh (Factory New)
#4 Souvenir M4A1-S | Imminent Danger (Well-Worn)
#5 Souvenir R8 Revolver | Bone Mask (Field-Tested)
#5 Souvenir USP-S | Night Ops (Well-Worn)

Have a great day and have a wonderful holiday season !!