Are relics only considered first class if they were collected from a Saint's dead body? I was seemingly corrected that St. Maximillian has no first class relics since some of his hairs apparently were found (collected prior to his death).  Would these be first class relics or second class relics?
You answered this question yourself in your other answer.

Relics are the remains of a saint. They are classified according to degrees. First degree relics are physical remains of a saint. They are most typically bones. Second degree relics are objects or items that touched a saint while he was alive. The relics of Christ's Passion would be second degree relics. Third degree relics include anything that touched other relics. Normally, it is the bones of the saints and the relics of Christ's Passion that are mentioned among the relics.
— Catholic Forum: Relics

The hairs are certainly not merely items that touched the saint. They are of his body.
Physical remains are first-class relics.