In Aus, Consumer Laws say that the product "must be fit for the purpose". Ofcourse we now have consumers who interprate this to mean "fit for any purpose that i want to use it for". And that my friend is what you are doing: the item is fit for the purpose of working in an A1200, but you want it fir for the purpose of it working in a third party case that is clearly not an A1200. Saying IF you knew that it wouldn't fit in your third party case that's not an A1200 you wouldn't have bought is irrelevant, because AmigaKit didn't know you were going to fit into that third party case and never said it could fit into the third party case.