When I click the eye (instead of the trashcan) to view details, the dates on that don't match the date on the scan date. Weird.
Mine don't either. A couple of mine are even from 2018. I suspect those dates are the timestamp of the detected item rather than the timestamp of the scan.
I found the report files. They can be found in C:\ProgramData\Malwarebytes\mbamservice\ScanResults
When I look in those folders, I I found almost 700 files going back to 9/22/2018. This is about the time I installed V3.0 IIRC. Each file takes up less than 2Kb of space so they are not space hogs. But still, I don't need 2 years of logs on my system.
I could not delete them because Malwarebytes had the folder locked. So I exited the program, purged the folder and restarted Malwarebytes. It then showed no scan reports. I ran a quick scan and 1 report shows and the program seems to be running fine.
So, if you want to purge your reports, it appears safe to do so manually.