MEMORANDUM
The First Trust Combined Series 615
File No. 333-264386
The Prospectus and the Indenture filed with Amendment No. 1 of the Registration Statement on Form S-6 have been revised to reflect information regarding the execution of the Indenture and the deposit of Bonds on December 6, 2022 and to set forth certain statistical data based thereon. In addition, there are a number of other changes described below.
THE PROSPECTUS
| Cover Page | The date of the Trust has been added. |
| Page 3 | The following information for the Trust appears: |
| The initial number of Units of the Trust | |
| Sales charge | |
| The Public Offering Price per Unit on the opening of business on the Initial Date of Deposit | |
| The Termination Date | |
| Estimated net annual Unit income | |
| The first and second distributions and record dates | |
| The Estimated Long-Term returns and Estimated Current returns (if applicable) to Unit holders as of the opening of business on the Initial Date of Deposit | |
| Essential information based on all distribution plans | |
| Page 5 | The Report of Independent Registered Public Accounting Firm has been completed. |
| Page 6 | The Statement of Net Assets has been completed. |
| Pages 7-11 | The Schedule of Investments has been completed. |
| Back Cover | The date of the Prospectus has been included. |
The Trust Agreement and Standard Terms and Conditions of Trust
The Trust Agreement has been conformed to reflect the execution thereof.
/s/ CHAPMAN AND CUTLER LLP
December 6, 2022