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Looks like the plastic is just stuck. Sometimes the release agent used in manufacturing isn't fully cleaned and this stuff sort of acts like a weak adhesive after years of humidity and close contact.
I think you're going to have to crack it open and hope you don't crack the plastic in the process. You can try heating the seam with a heat gun (carefully!) or a hair dryer. If nothing else, the heat might prevent the plastic from cracking.
Good luck.
John
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