My first question is what are they using the certs for and how does this involve you?
(is that stuff necessary?)
Not that I'm aware, but I'm not an expert.
As long as the rest of the file is composed of certs in pem format then you should be ok with what you did.
pem has "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----"
Like I said, I'm not an expert but my guess is that your customer has you chasing ghosts.