Daytona.67

I am an LPN and I have a question about false documentation. I know it is illegal to chart ahead on a patient. My question is this...When your supervisor comes to you and says that some nursing assessments and progress notes are missing on certain days. They tell you to go back to that specific date and see if you were working. If you were and it was your patient that day, do your assessment and progress note for that day. Would this be considered "false documentation" since the documentation isn't done in real time? How can you document on a patient you haven't assessed in 3-4 days and put accurate information? I am worried about this since a nurse was recently fired for false documentation.