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I recall seeing a video on this several years ago. If I recall correctly the person who made the video could tell by the sound of the slab when tapped on a surface that the ultrasonic seal was weak and could be cracked opened easily.
I wish I had known before hand, would have been interesting to see how hard it was to get it open. I remember just hitting it once wrapped in a towel and feeling it come apart completely. It was a very clean separation along the seal line but it did chip a little bit where I had hit it.
I assume something just went wrong during the seal, but now I kind of wonder if there was just something defective about the plastic on that one that didn't allow a proper seal