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If you float tested them then you can eat them. Eggs can keep in the fridge for 4-6 months so unless you have a shell that's really permeable or really dirty or whatever... you'll know it when they float.
a couple of years ago I did the Great Egg Experiement where I kept unwashed duck eggs on the counter to see how long they'd keep. after 4 months, I still had good eggs... at room temp. granted, over the 4 months, a few spoiled from hairline cracks, and a few dried out too much to be appetizing, but the percentage is small.
your eggs are probably just fine at a week in cold temps, provide the ducks aren't broody.
you can suggest the folks they're going to just crack the eggs into a separate dish to check for issues (smells off, cloudy, doesn't look right in some other way) before adding them to the batch of whatever they're making so if they DO get a bad one, it doesn't spoil the whole batch.