as a botanist with a PhD relating to trees and years of experience in the tropics , I can attest to the enormous difficulty in identifying small pieces of 'old' wood in order to establish what species it is . I would have thought that unless you tell the customs / border officials what it is made of , they would have no idea whatsoever and little means of finding out in reality. That of course wont stop these unpredictable creatures confiscating your property on some pretext !
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