I block any attempt to open packaging, and simply quote our very generous return policy. I have been getting a little upset at the mouth breathers who can't properly open a heyday package without ripping off the top.
Sampling is not a thing, I never want to invite window shopping that would fill up an endcap with mark downs, especially since this could invite them to come back later and pickup the same product cheaper. The internet is a thing, if you want pictures of it then there are high resolution pictures on the internet that are more than what your dollar store glasses can handle viewing.