Hong Kong University of Science and Technology (Guangzhou), together with the University of Science and Technology of China and HKUST, released MEMCUT, a benchmark with dual metrics distinguishing 'native recovery' from 'residual recovery'. It found that after deleting direct records, secrets could still be recovered from residual evidence in 85%-99% of cases; even with LLM-assisted cleanup, 39%-76% of secrets remained inferable.