Not everybody understands the meaning of F1, F2, etc. The breeders may be confused as are their customers when they sell higher F numbers. Generally, as said, the higher F number would lead to breeders buying them to outcross rather than pair up siblings if they know what is going on. However, the seller may not have known how to properly assign F1 etc and they may not be as advertised.

If a seller claimed F2 or higher, I would ask for documentation on it, seeing as F2 would indicate they know something about the animals history, they should be able to answer where they got the number from.
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