When I do a search for an e-mail address, it show’s up in another e-mail chain. If the e-mail searched was Bcc, would it show up?

I am researching all e-mails from a particular e-mail address.  All the e-mails show up but another e-mail chain shows up between me and another e-mail address.  If the original e-mail searched was Bcc, would it show up?  I think the "other" e-mail address was Bcc-ing this other person.