A little back story for context:
I was brought in to help fix an issue with a WordPress Theme Update & Migration gone horribly wrong. Long story short, when the guy that did the move finished the work he somehow 'lost' all the blog posts...6 years worth of blogs posts.
Luckily I was able (from what I can tell) find a full backup of the old website before it was migrated, in addition to a copy of the MySQL DB.
However, it seems that it was a multisite configuration - and after uploading all of the web files to a sub-domain, and replicating the DB (as best I can tell) the website is still not accessible.
I've pretty much given up on the idea of fully replicating the website as it was - I feel like I've tried everything. With that being said - the only thing that's really important to the customer are the blog posts.
My question is this: If I still have the original web files, is there some way to extract the blog data and inject it into the new WordPress website? If so, how would I go about doing that?
These types of issue(s) and/or troubleshooting is not something I have a lot of experience in - as i'm really just a front-end developer.
Any/all help is greatly appreciated!
(if more information is required to help - please let me know and I'll provide it ASAP)