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You need to install the optional package database_cremona_ellcurve which contains many more curves than the default database included into Sage:
sage -i database_cremona_ellcurve
Then your first try works:
sage: E = EllipticCurve(QQ,[0, -1, 0, -1008, 48512])
sage: E.cremona_label()
'48400ch1'
