Just a quibble in #1...I don't think the book indicated anything, unless you have a talking book. I think there may have been an example in the book, or an illustration in the book, or instructions in the book. So I would rephrase the sentence as "Press the keys as shown in the example." I don't know that "book" is necessary unless it is possible they would be looking at something else. I think there is some poetic license in #2 that has nothing to do with grammatical correctness.