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Old coins are always good.
Postage stamps have really stood the test of time.
Yet you could go risky.
Wide assortment of properly stored DNA samples of a super large assortment of the worlds animals.
Whatever you do though, make sure you put a jack in the box that springs out when opened and scares the crap out of them as well.
Lastly maybe a letter or diary explaining yourself and if you feel a given way an apology for what our generation may have done.
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