So I ended up almost buying an umbreon lanyard from the same seller, which is something I thought didn't exist a few months ago. Unfortunately only 5 minutes before the end of the auction, bids have skyrocketed to over 25,000 yen and the auction is still going due to yahoo's auto extension rule as I write this. I can confirm that lanyards exist with Smoochum, Wooper, Chikorita, Pichu and Umbreon on and despite the endless google searches I've done, in both English and Japanese, I can't seem to find a picture of a Magby lanyard anywhere, even on the old Japanese official website. It would make sense that it exists though as straps exist for all of the other 5 and Magby, so if lanyards exist for the other 5 there must be a Magby lanyard, even if it seems to be incredibly illusive. Also I can't seem to find images of the Umbreon lanyard anywhere else so I decided to save the images from the auction for future reference. In the future I think I'm going to try to make a document with a list of all the Pokemon Mini Merchandise in existence, to my knowledge, because the documentation of it is few and far between.