Access logs uploaded to and processed by Reporter are not visible in the reports.
When transferring old access logs to new Reporter instance it's important to make sure access logs are not older than database's expiration period.
For example, if your access logs are 95 days old and Reporter is configured to expire logs older than 90 days, these logs will be removed from the database - you will not see them in reports you create.
Increase Reporter's database log expiry period. This can be modified in RPAC from Management Center: