PoF label
That could stand for Pigs or Ferds.
If the bottle isn’t opened in front of you, you are relying on the word of people who have no halachic ne’emanus.
If they had open packages of meat, you wouldn’t eat it, so the issue is how seriously you take cholov Yisroel.
If you take it seriously, you won’t rely on them. If you think it’s a nice chumra, but it doesn’t really bother you if it’s cholov stam, I suppose it’s better than if you knew for sure that it was CS.