John: I acquired a case from a defunct .333 Jeffery double with the same length barrels, oak and leather with brass corners, and subsequently acquired an original leather trade label. Unsurprisingly, Jeffery's doubles were all sized exactly for their proprietary cartridges, and the .400 is a tight fit in the .333 case despite the same chambering head-size.

Buckstix: The majority of my trade labels are made using Adobe Photoshop and cost less than a dollar too, but early on I bought Army & Navy, and Colt Pistol card labels, from Dysons. I regarded them as cheap. Also bought a Watson & Hancock trade label once, simply because it featured a really cool vintage hunting scene involving tigers being shot from howdahs, although I will never own a Watson & Hancock gun!

...and I make prolific vintage cartridge box labels by Eley, Kynoch, Nobel etc and tie the packets up with string, just for the pleasure of ripping them open to spill the cartridges out on the bench at a big game rifle shoot!