Seems like a pretty important detail to leave out.
You got them from someone who has a script for 30mg instant release oxycodone? Can't you ask for the original package or some kind of proof of their authenticity? It seems like a very reasonable request considering legit IR oxycodone tablets are very rare (especially the "M30") and expensive.
It's just very weird that a dealer with a legit oxy script would sell the most commonly counterfeited version of them and not provide any kind of proof. If he's also selling them for a relatively low price then that would be even more suspicious.
Real M30 are generics marketed by Specgx Llc (a Mallinckrodt subsidiary), the 30mg ones should be light blue, not pure white as you said (the 100% white ones are 5mg and the green ones 15mg).
https://ndclist.com/ndc/0406-8530
But visual identification isn't very reliable (as it has been said), which is why most pill identification questions aren't really allowed here.
If you decide to take the pill without testing them first then please start small and work your way up, take a tiny piece and wait at least 30min before redosing.
Edit:
I missed this part:
Just be aware that fent may not be evenly distributed, some fake pills contain hotspots. Hope you can get a test kit soon.