Quote: Were they stinky rotten 'bad' or just too old and/or dirty for you to eat or sell?
If not straight up rotten, you could always scramble them up and feed back to birds.
Hidden nests, with chickens you can confine them for a time to 'train' them back to using the coop nests.....
......not sure that works with ducks tho, I've never had ducks.
I use the dirty eggs myself, wash and refrigerate right away...always cook well, often hard boil them.
Unless they are absolutely covered with poop, which is rare here, then I toss them.
It's taken awhile(2-3 years) to establish a good customer base that is in balance with my population and production.
I have 4 regular customers that I supply regularly all year,
they deal with the ebb and flow-had to do some 'rationing' late this summer,
and a few others who will buy when production is high.
That all works for me but I only have 15-18 birds over winter and only sell about 3-5 dozen a week.