Order transcripts from IRS and contact the state for the same. Reconstruct. Assume the old preparer died or had a melt down. I sold my practice 15 years ago. It sold again. I stayed connected as landlord for a building that started housing a tax office in 1956. Some of the old clients stayed in touch and a few reached out when they had problems. At the end of 2023, the 2nd purchaser of my practice sent me a letter on 12/31 that the keys are in the mail and he will not be paying rent beginning in January 2024. He had a lease that was valid through 2026. He had a melt down. Last year was tough for me to clean out and sell a building and field calls from clients as to "where is my stuff". The preparer just did and ostrich and buried his head in the sand. I am sure that he has the records, as nothing confidential was left in the building. Calls to him from clients went unanswered. It took showing up at his doorstep to get his attention and get a resolution to the lease problem. 

Everything the client gave the preparer can be reconstructed. Start doing so.