I purchased the "Hajimete Zukan" (First Picture Book) three years ago and the "Mainichi no Kotoba Zukan" (Everyday Words Picture Book) one year ago. I only replaced the pen for the "Hajimete Zukan." I bought it on Mercari. Therefore, I don't know about the previous owner's usage. It was in very clean condition when I bought it. Both pens work without any problems. (However, I haven't checked every page. I checked a few pages and the audio played without issue, so I think it's fine.) I'll leave the batteries in as they are partially used, so you can use them right away★ As shown in the photos, the picture book itself has some tears. I've reinforced them with tape. I will wrap the pens in bubble wrap. The books will be wrapped in plastic and shipped in a cardboard box.