I would focus more on teaching son to do what is expected. In a perfect world a teacher would have time to ensure it but, as a kindergartner, this is a skill he needs.
Work with him on knowing his lunch plans. Remembering his lunch plans. And carrying out his lunch plans.
If he will be bringing his lunch every day make sure he knows not to get in lunch line.
It could be that in the craze of first day jitters he just forgot. Or got scared. Or was intimidated to speak up.
I'm sure that a few days of practice will have him acting like a pro.
Just keep instilling in him the skills and confidence to speak up for his needs and practice remembering his lunch plan.

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