I can remember when we got a rabbit from P@H. Apparently a dwarf lop and 8 weeks old. He grew far too big to be a dwarf lop, and he was far bigger when we got him than my little lady we have now who is an 8 week old rex, and she'll end up bigger than he was once's she's fully grown.
I even asked how old a rabbit was they had the other day. Standard 8 weeks old response and apparently a dutch, the rabbit had been there since before Christmas and didn't have dutch markings, so they don't seem too keyed up on their stock.