^ are you sure that your ayumi albums are all S'pore presses ?
cos from what I know , Warner S'pore only started to produce her albums locally from (miss)understood onwards or I could be wrong about that
just check the back of the albums as to where it was manfactured in . If they put manfactured & marketed by avex asia then yes that's made in Taiwan .
if not it's S'pore press if it's stated manfactured , marketed & distributed by Music Street (for mu's case) or Warner Music S'pore