The capsule contains Hydrogen Cyanide. It is a suicide pill and was (arguably still IS) issued to covert agents and black-ops personel for missions behind enemy lines. The idea being that if the agent is caught he should take the pill (kill himself) to deprive the enemy of a chance to interrogate him and possibly succeed in extracting important information.
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You put in goods or information for the future to use in a time capsule.
This is undermined by its steadfast refusal to put its money where its mouth is.
The top Nazis all had cyanide capsules. These were really tiny glass ampules full of cyanide, about the size of a cold capsule. Hitler was not sure they would work so he tested one first on his faithful dog, Blondi. He still was not convinced, so he put the glass capsule between his teeth and shot himself in the head when he bit into the capsule.
Ancient Greeks put coins in the persons mouth so in when they are leaded to the afterlife they can pay to cross the river to the underworld
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