Yup no seal. Always check the security ring. I have found those compromised a couple times at a local auto store.
Sometimes noticed the levels not all the same too, makes one wonder.
My last purchase of PYB jugs I ordered from Amazon. 1 jug had slight leakage. Also they boxed the jugs laying on the sides, not upright. Makes me wonder if the package was delivered left outside with the recent triple digit temps how much worse it could have got.
Not enough to prevent me from ordering again, but if it continues then back to the local store for all jugs of oil purchases. Or change to something with the foil seals.