Here are the main things I noticed from the S.M.A.R.T. information you provided:
- As you suggested, the drives show some usage (Power Counts, Writes and Reads) this is noted in the report summary and the SMART data, however, it is minimum (300+ GB and 10+ GB) when compared to the endurance ratings expected from the Intel® SSD DC S3500.
- The SMART counters that would be related to any issues in the drive are OK. Bad sectors, errors, failures and wearout are all clean.
You can review the details about the SMART attributes in the Intel® SSD DC S3500 series - Product Specification, pages 21-24.