You will find Miranda when you visit the Kickstand (the bar) for the second time. After entering the bar and watching the news cast (also good for another achievement), head behind the bar to the dumpster. If you are having trouble finding it, just move your cursor to the left of the Kickstand sign. It will change into a right facing arrow. Once behind the building, Look at the dumpster. Miranda will tell her story and then offer you the ID.