1. A method of verifying the contents of a package, the method comprising: obtaining a spectral image of a first package, the first package having a plurality of receptacles configured to receive an item, wherein the plurality of first package receptacles do not contain any items; acquiring a spectral image of a second package, the second package having a plurality of receptacles configured to receive an item, wherein the plurality of second package receptacles each contain an item; and comparing the spectral image of the first package with the spectral image of the second package; wherein acquiring a spectral image of a second package comprises acquiring a plurality of spectral image lines; and wherein each of the spectral image lines comprises a plurality of image pixels.