Hi 413j0,

Thanks for the testing out the design! I didn't think it would be feasible to 'pinch' apart the folded layers, at least not without damaging the tamper-evident tape. Honestly, I tried your technique for about 5 minutes, both with a needle and by manipulating the inner fold with some sticky tape on the end of a firm bit of cardboard, but I just couldn't get them to separate so as to attempt an illuminated photograph. I don't doubt you succeeded -- it's just that on my end I wasn't able to. Perhaps it's my paper stock (or even humidity!) that's making it difficult. In any case, I'll think on this challenge a bit and see if there's an improvement I can come up with on the design. In the meantime, your addition of extra duct tape (or as others have suggested, slipping in a bit of tin foil) are great ways to improve the light impermeability.

As a thank you for your work on this, if you private message me your mailing address I'll send you some of the brand new tamper-evident stickers that include unique sets of serial numbers printed in white thermal foil (see image below).