Just before midnight on September 12, 1997, six men in ski masks slipped through a side door of a nondescript warehouse on Mateo Street in downtown Los Angeles, using a key that should never have worked. Inside sat America’s cash bloodstream: the Dunbar Armored depot, a fortified way station where armored trucks loaded and unloaded the currency of an entire region. By the time the men walked out, they carried $18.9 million in unmarked bills, more cash than had ever been stolen in a single robbery on American soil — a record that still stands. There were no shots fired, no alarms triggered, and, for a while, no leads. The reason was simple and unsettling: the mastermind had once been paid to protect the very vault he was about to empty.

A Guard Who Knew Too Much

Allen Pace III was not a career criminal. He was a regional safety inspector for Dunbar Armored, a job that gave him near-total access to the Mateo Street facility — its floor plans, its camera blind spots, its guard rotations, and the precise minute each night when the cafeteria emptied and the vault crew grew thin. Over months on the job, Pace quietly photographed the depot’s interior and mapped its routines, compiling what amounted to an insider’s blueprint for the perfect heist. He wasn’t acting alone in his head, either: he had already begun recruiting from a small, tight circle of childhood friends from Belmont High School, men he trusted precisely because none of them had any connection to Dunbar at all.

Fired One Day, Robbed the Next

In a detail that still strikes true-crime researchers as almost too cinematic, Dunbar fired Pace the day before the robbery over an unrelated dispute involving tampering with company vehicles. Rather than derail the plan, the timing may have worked in his favor — his termination meant no one at the depot was watching him with fresh suspicion when the crew struck barely twenty-four hours later. On the night of September 12, the six men gathered first at a house party, establishing alibis in front of witnesses before slipping away. Pace used keys and access codes he still possessed to let the crew into the building, where they hid inside the employee cafeteria and ambushed guards one by one as they arrived for their break, restraining them without firing a single shot.

A Getaway Without a Trace

The gang loaded $18.9 million into a rented truck and vanished into the Los Angeles night. Unlike a bank job with dye packs and marked bills, armored-depot cash is often untraceable — bundled currency bound for redistribution, not sequential serial numbers logged for a single transaction. For nearly two years, investigators from the FBI and LAPD had a crime scene with almost no forensic story to tell: no forced entry, no broken locks, no eyewitnesses who could identify masked men. The absence of violence, ironically, made the case colder. Detectives increasingly suspected an inside job, but suspecting is not proving, and Pace had already been let go from the company before the robbery, giving him a built-in alibi of sorts: why would a fired employee still have the keys memorized to the minute?

The Slow Unraveling

What ultimately cracked the case was not a forensic breakthrough but the oldest weakness in organized crime: money changes people, and people talk. Investigators built a case linking Pace and his crew to sudden, unexplained spending and to informants inside their social circle. By 2000, federal prosecutors had assembled enough evidence to charge Pace and several accomplices. On April 23, 2001, Allen Pace III was convicted and sentenced to 24 years in federal prison for orchestrating what remains the largest cash robbery in United States history. Several co-conspirators were also convicted and sentenced in the years that followed, some receiving sentences exceeding two decades for their roles in the six armed robberies tied to the broader Dunbar conspiracy investigation. Yet even after convictions were secured, the money itself told its own story: only about $5 million to $7 million of the $18.9 million was ever recovered by authorities, leaving well over $12 million permanently unaccounted for.

Freedom, Silence, and Missing Millions

Pace served the bulk of his sentence at the Federal Correctional Institution in Safford, Arizona, and was released on October 1, 2020, after more than two decades behind bars. His co-conspirators, too, have since completed their sentences and returned to civilian life. None of them, in the years since, has publicly revealed where the missing millions went. That silence is arguably the most enduring mystery of the case: the crime was solved, the men were named, tried, and imprisoned — and still, roughly $12 million in cash from a single September night in 1997 has never resurfaced, whether spent, buried, laundered abroad, or simply lost to time.

Why This Case Still Matters

The Dunbar robbery reshaped how the cash-in-transit industry thinks about its own employees. Security consultants still cite it as the textbook case for “insider threat” risk — proof that the most dangerous vulnerability in a fortress isn’t the wall, it’s the person who was handed a key to test it. In the decades since, armored-transport companies have overhauled background-check protocols, camera redundancy, and access-revocation timing specifically because of what Pace demonstrated: that intimate operational knowledge, weaponized by someone with nothing left to lose, can outmaneuver even the most literal fortress. It remains, by dollar value, the largest cash robbery ever committed in the United States.

Nearly thirty years later, Allen Pace and his accomplices are free men, having served their time and, by all accounts, revealed nothing further. Somewhere, if it was not spent long ago, more than $12 million in untraceable American cash from that September night may still be sitting exactly where it was hidden — so where, after all these years of freedom and silence, could it possibly still be?