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The glass all looks mint and very clean. I can see no problems inside on the optics when I view through the lens toward a light source.
Not just any light source will show problems. With my old Maglite I can see some problems, but with my new LED flashlight, I can see every speck of dust, every hair, every little bit of fungus, mildew, or haze. I would recommend getting a good LED flashlight and carefully checking every edge for problems. Anything which is more structured than random dust should be examined. Anything which appears to glow when the light is shone from behind is a potential start to more serious problems. Anything which looks like thin strands of spider web may be fungus.
If there is something there, I presume it is minimal, since you saw nothing on the first attempt. In this case you could either send the lens back, or try to rectify it. Apparently shining strong UV light through a lens will kill off spores, and you could of course have it torn down, cleaned and reassembled, although this can cost many hundred dollars.