not in AZ
Desert heat won't harm them. I'd be a little concerned with high humidity, but not for just a few hours. Direct sunlight wouldn't be great, especially if the cards were in semi-rigids, but if they're in a mailbox they will be OK.
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“Hypocrisy is a tribute vice pays to virtue” - Francois de La Rochefoucauld.
If we are to have another contest in the near future of our national existence, I predict that the dividing line will not be Mason and Dixon's but between patriotism and intelligence on the one side, and superstition, ambition and ignorance on the other. - Ulysses S. Grant, military commander, 18th US President.
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