Unaddressed Stock Capital Loss in 2022 Tax Return

Last year, I sought assistance from an accountant to prepare my 2022 tax return. However, upon reviewing the documents today, I was unable to locate the Schedule D and realized that my stock capital loss of approximately $10,000 for the year 2022 may not have been reported. Despite my attempts to reach the accountant, I discovered that he has resigned and is untraceable. I am uncertain about the next steps to address the stock capital loss for 2022. Any guidance or assistance would be sincerely appreciated.