Couldn't find a case to match with GMK Copper so I made my own from scratch ! (with genuine copper patina ! ) : r/MechanicalKeyboards
The Copper Semi Conductor Mechanical Keyboard and 2400dpi - Etsy
My first kustom keyboard! TX60 HHKB Copper Antique : r/MechanicalKeyboards
K96 Customized Bt+ Dual-mode Mechanical Keyboard,upper Lower Eva Sound Absorbing Cotton Belt Type-c+usb Double Head Receiver, Full Key Non Conflicting Copper Sleeve Plug Pull Out Shaft Gaming Keyboard Compatible Android/ios/ - Temu