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If possible keep them in a paper bag in the bottom of the fridge - the paper (as opposed to plastic - will stop thm sweating. Mushrooms have a high water content so tend to dry-out after a few days, but if this happens they can be revived by immersing in boiling water for 1 minute.
They can be frozen if necessary, just pack them, whole or sliced, in air-tight containers and freeze for up to a month - pre-blanching can toughen them. Alternatively, freeze them finely-sliced and sautéed in butter.