By default, you can view last one year audit logs. As of now we have data from January this year as we have released this feature in January. The page will keep loading additional data as you scroll down.
Even the search feature will search the data from the last one year(As of now from Jan 2017). You need to scroll down to see more data. Please get back to us in case you are facing issues checking the old data.
Please refer the sample screenshot shown below. We are able to see the data from Feb 13, but the current date is March 30.