  Seyfert galaxies have not been detected by COMPTEL on the Compton Gamma Ray
Observatory (CGRO) in the energy range 0.75-3 MeV, placing upper limits on
their emission which are more than an order of magnitude below previously
reported detections. Here, we extend our previous work to the energy range 3-30
MeV. Again, we find no evidence for emission from a cumulative sample of X-ray
bright Seyfert galaxies. We use the recent results on the extragalactic
background at MeV energies to constrain the possible emission of these sources
and their contribution to the cosmic extragalactic background (CXB). The lack
of $\gamma$-rays from Seyfert galaxies strongly argues against hadronic
cascades as the underlying radiation mechanism and, consequently, against
recent claims that Seyferts might produce a high-energy neutrino background
with an energy flux similar to that of the CXB.
