"Sealed" would seem to imply perfect. Not always the case.
I’d much rather buy a lp I wanted from a trusted seller who has cleaned and played a lp I wanted rather than buying the same lp sealed.
I agree. For example you cannot see the stamper no. on RCA Living Stereo or Mercury Living Presence LPs. Nor can you always tell whether the record is original or a reissue. Nor can you tell if the LP is warped.