"existing reports" is correct and usable in written English.
You can use it to refer to reports that have already been published or written. For example: "We based our analysis on existing reports about the company's financial performance."
Based on existing reports, do you think this story depicts events as they actually occurred?
Existing reports do not elucidate trends in patient selection, technique, and outcomes over time.
'This is just a rehash of existing reports and includes no data of systematic trials to test GM food safety.
Because PLD inhibition could represent an important function of alphaSyn, we sought to extend existing reports on this interaction.
The present study provides a theoretical support for existing reports that a GDL with a gradient porosity improves cell performance.
These findings are consistent with that of existing reports on the active site residues pivotal at mPGES-1 active site.
They also solicited advice on how PCAST might make a unique contribution to the raft of existing reports and analyses.
Though little data is available, existing reports indicate that female farmworkers are subjected to high levels of exploitation, harassment and abuse.
We knew the details of what some countries do already from existing reports like that of the Interception of Communications Commissioner in the UK.
Our experimental results in conjunction with existing reports [37, 45 48] suggest that a detailed treatment of the background MR is required.
In some cases, the entries in the database may suffice to prompt searches of existing reports (including unpublished findings) that will plug knowledge gaps.
