We monitor many-body interference signatures across the dynamic regime of the Bose-Hubbard model. Reducing particle identifiability increases the temporal variability of minority observables, with dramatic amplification at the onset of quantum chaos. We describe this amplification as a general initial-state coherence fingerprint in the eigenbasis by resolving the exchange symmetry of the partially discernible particles. In a region of fully developed quantum chaos, ergodic delocalization of eigenstates suppresses this fingerprint.
