That example doesn't give an indication as to WHY the acknowledgements were moved. I think they are not moved unless they start at the beginning of the book and are CONTINUED in print to the back. Then it would be appropriate to move the whole thing to the print page at the back where the rest of it appears. However, in your specific situation, if the acknowledgements are contained at the beginning of the book, braille them in print order. In that case, use p-page numbers.