How to send transcripts to colleges?

Hey everyone!
I’m an Indian and am going to apply to universities in the USA for my Bachelors. I have attended 2 high schools between grade 9-12. Some universities have asked me to get my schools to send my high school transcripts.
The problem is that neither of them is going to do that. Both the schools have handed me sealed envelopes containing my transcripts but they have denied my request to send those to the universities.
So, should I put both the transcripts in one envelope and send it or should I send the transcripts separately?
I need to make the decision in 2 days. Please help me out people!

I put both in the same envelope and sent it.
Just write a cover letter saying that they were sealed by your school.

Well, if they are sealed by your school, I assume they have your school’s seal on there. So don’t worry. Put them both in a single envelope and send it to the universities.