Clear it in 3 steps
Start the environment
Investigate the target
Submit the flag

audit_samples.py is generated from the FLAG injected at startup. AST-detect shell=True and hex-decode review_token fragments to recover the flag.
Inspect audit_samples.py and identify the target record
AST-detect shell=True and hex-decode review_token fragments
Verify that the reconstructed value has FLAG{...} format