From the news story that was linked, which is pretty recent:
"The FDA is aware of a handful of reports linked to that specific lot of seized pens, however, the reports don't seem connected to the fake pens. The FDA and the maker of Ozempic are running tests on the fakes to check if they are safe. The real deal can cause stomach upset, so it's hard to know if these reports are typical side effects."
The article makes it sound like real Ozempic was stolen. Plus, how long does it take to test these things? Seems like they should have an answer pretty quickly.