Whole corn is frequently used to clean out the machinery in a mill. The ingredients list is supposed to (by law, if I'm not mistaken) list everything that is in the feed. So if corn is not in the list, I'd guess that you just happened to get feed produced shortly after the machines were cleaned, and not all the corn had made it out.
Ingredients like "forage products" can vary a bit, but if there's corn as an ingredient of any sort, even as by-products from production of other things, you should be seeing the word "corn" somewhere.
Corn can mold relatively easily, and the mold produces a toxin that is frequently deadly to rabbits. Most feed, however, does actually contain corn as an ingredient. Ground up and included in the pellets, the corn is much more likely to mold than if it is whole. Still, properly stored feed should not have a mold issue with the corn. It has to be properly stored all the way down the line, though, not just by you. I bought pellets once that had just arrived at the feed store that day, and they were already molded when I opened them that evening. Either the mill or the distributor had stored the feed improperly. It wasn't the feed store's fault. I can see how all their feed is stored.
__________ Sat Jun 18, 2016 11:18 am __________
Forgot to mention, even in feed that does contain corn as an ingredient, you don't want it high on the list. Most members here try to get feed that does not have corn or molasses among the first five ingredients listed. Both are high in sugar and can make rabbits fat. And can cause GI upset in sensitive rabbits. But again, everybody has to deal with what's available to them, and sometimes it's not the best. And sometimes rabbits will do better on a "lower quality" feed (ingredients like yeast byproducts, forage byproducts, and higher corn or molasses) than on a "higher quality" feed (ingredients like alfalfa, wheat middlings, and lower corn or molasses). <br /><br /> __________ Sat Jun 18, 2016 11:20 am __________ <br /><br /> If I had your situation, I'd definitely go with the 18% feed. Better people, hopefully better storage, and cheaper to boot.