[Fastera]

I would imagine you can do "sealed box method", "item not in the package" (but that would depend on the item, more specifically the weight), you can claim that it is defective online after the fact and box them as well.
I would imagine many of the regular methods would likely work apart from the obvious ones such as DNA.

All that is my theoretical thinking. I have not done what you are attempting so take it as such.