You can issue an invoice for buying a box lunch on the high-speed train, but you need to ask the flight attendant for it voluntarily, and the general flight attendant will not offer it voluntarily.

Expansion:

The real-name registration system high-speed train ticket will be officially implemented nationwide. You have to buy tickets with your ID card a few days in advance, and taking the bullet train will become a new habit for people. After the implementation of real-name registration system, except for children who ride free of charge and children with children's tickets, passengers who take the bullet train must purchase tickets and enter the station with their valid identity documents.

Valid identity documents include resident ID card, temporary id card, household registration book, military security card of China People's Liberation Army, military officer's card, armed police officer's card, soldier's card, military cadet's card, military retired cadre's card, passport, Hong Kong and Macao residents' pass to and from the mainland, Chinese people's pass to and from Hong Kong and Macao, mainland travel permit for taiwan residents's and mainland residents' pass to and from Taiwan, foreigner's residence permit, foreigner's entry and exit permit, Diplomat's card, consulate's card, seaman's card, foreigner's identity certificate issued by the Ministry of Foreign Affairs, passport loss report certificate issued by the exit-entry administration department of local public security organs, and temporary identity certificate issued by railway police Department.

Reference: People's Daily Online _ Is there an invoice for buying a box lunch on the high-speed train?