Certainly there was. They lied to doctors about how addictive that it was, praised the security around the timed release coating, which was found to be easy to remove, and then pushed the lie of "breakthrough pain" to sell more drugs at higher doses to continue providing those they had gotten addicted. They had the FDA fooled, and then when the truth started coming out, hired the very same FDA agent that approved their fraudulent label in the first place.
‘A toothless paper tiger’: 25 years after release, FDA regulation of Purdue Pharma’s OxyContin has many critics
Now, looking at Pfizer, who had to be forced by a court to release these docs. Why not be transparent? If a court has to force you to be transparent, then IMO you've got something you're really trying to hide.