In some of the bud I harvested from Super Silver Haze I just grew, there seem to be some tiny green seeds. They’re very fragile and I don’t believe they could ever sprout. But does that mean there was a hermie or a male nearby?

Yes, you could have a hard to see hermie flower hidden in the middle of otherwise normal female flowers. Late hermie flowers do not necessarily look like true male flowers, not so much the pouch ball, they might look kind of like a banana or yellow banana pepper, with just the pointy end sticking out of the cluster of normal looking female flowers.