I have only one chopstick sleeve in my collection, a humorous, slightly risqué one from a ramen and gyoza shop in Yokohama that I frequent. Here is a photograph with transcription and translation:
https://gally.net/temp/20250120sanyochopsticksleeve/index.ht...
Another kind of commercial ephemera that people collect in Japan are the paper covers that bookstores provide for customers. Each bookstore typically has its own design. Here is one collector’s blog:
https://bookcoverfan.livedoor.blog/
Some bookstores also provide their own bookmarks. Here is a collection of those:
https://hyohyosya.hatenablog.com/entry/2015/09/13/%E3%81%97%...
#UnsolicitedTestimonial
https://media-cdn.tripadvisor.com/media/photo-s/0d/e7/bb/a7/...
That said, before they translated it to English for the tourists, you could order more stuff with it.
https://live.staticflickr.com/65535/49277747203_7f23e589cf_b...
Like those construction site warnings or info boards. In most places it's just functional and bare. In Japan they add cartoon characters, nice layouts, fonts etc.
That was my point.