Your original question said the hatchery, so 'usually' hatcheries will refund you the difference. The feed store seems to have their own policy and wants to make it right, which is a different situation. I've never heard of 'hatcheries' taking back fowl, they just refund the difference between a male/female, after their 90% guarantee window. Which is actually frustrating when you think of it. It takes awhile to tell the difference in most breeds, you've fed the fowl, become attached and now you get a $1 or so difference back. It is better than nothing.Well, not this feed store. I called and they want me to bring in my suspected male African gander to trade for a marked female they have on hand. So now the question is... Do I put my son through that? Also geese don't do well alone, 1 gosling alone would be so lonely until such time as it is big enough to introduce to the group of older goslings.
As far as the feed store goes, I would ask them what their plans are for the male. Do they just want you to bring him in for documentation and then they'll let you keep it? If they keep it, what are their plans for it?
As far as personally what to do with it, that's going to be a tough choice on your part. We originally told our kids we were only keeping the ducks if they were females. One is, one I'm not sure of. Then we got 2 more as part of an assortment. We are still sticking with 2 ducks only but of course the kids have become attached to the one that we aren't sure of. My husband isn't a fan of duck eggs but I figured we could use them for baking but it looks like we might have a 'free loader', if we like it or not.