Buried Treasure

Andrea and Norman have presented their decks to each other for Game 1 at their local Modern PPTQ. Norman does a pile shuffle of Andrea’s deck and asks afterwards, ‘So you are playing with 61 cards?’ Andrea replies, ‘What?! No…’ and quickly checks her sideboard: There are 15 cards. They call you over as a judge to help resolve the situation.
While checking Andrea’s deck, you find a Treasure token in the same colour sleeve as the deck as part of what she presented. What do you do?
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Answer
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