Did he inform you about this, prior shipping? Did you agree on that? Answer both questions and you've solved your problem.
IMO that's wrong. If the package goes lost, they will refund the shipping costs + declared/insured value, if any.
Good luck with your case, honestly, if you were aware of no declaration and no insurance this means you've accepted the risk. If the seller didn't declare/didn't insure and didn't even inform you about that, to me it's his own decision to bear the risk and you should claim your money back (goods & shipping costs).
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