When I originally ordered my custom key chains, due to an oversight when I reviewed my proof (my fault), I neglected to view it in dark mode, so I never noticed that the white background of my logo was being printed as transparent.  Due to the kindness and generosity of the good folks at StreamYard, they allowed me a one-time chance to correct my mistake (at no charge), and I ended up getting some very nice key chains!  Kudos to StickerMule and their customer service.

StickerMule saved the day!