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It will probably come down to whether your potential buyers care about the matter. So if you know who you would sell the rabbits to, ask those people. Different relationships lead to minor changes in how likely you are to see problems, but I do not think the risk of physical problems is high...

Short answer: it is not likely to be a problem, but there are no guarantees. Long answer: Inbreeding like that will not CAUSE mutations. But if there are any recessive genes carried by both the male and the female rabbit, the traits caused by those genes will show up in some of the babies...