All Astrodon filters should arrive in Tamper-Proof packaging. There should be a seal on the envelope holding the filter(s) and a two seals on the filter box holding the filter(s) one on each side (so that the box can’t be opened by popping the hinge).  Please notify us immediately at support@opticalstructures.com if you suspect that your new Astrodon filters have been opened. Here is what the packaging should look like.