School-Specific Hitori Tokkun: Seikei Elementary School - Basic Edition & Advanced Edition, 2-Book Set Purchased on Amazon, but never used. Opened only for the purpose of taking photos. On Amazon, it was shipped in a cardboard envelope. I will repackage it in a recycled clear plastic bag for mailing. Please note that I am not a professional, so the packaging will not be as meticulous as a retail product. Thank you.