Record Keeping Question - Appraisals

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Quick question about record keeping. When you ladies and gents have a new appraisal done, do you keep the records of the old appraisal? Example, I had a recent appraisal done at the purchase of one of my flips and it came back at 34k we paid 30k put 32k in it and it was just reappraised at 84k. Now do I need to hold on to both the old and the new, or can I just keep the new? Please let me know what you guys think, would do, or have done. Thank you!