The shattered glass was long gone on Thursday, the door has been replaced, and the popular Wells Fargo Museum in the heart of San Francisco's financial district had added exhibits.

There were even flakes of gold and a few nuggets smaller than a penny on display.

But the gold nuggets worth an estimated $10,000 that were stolen last month remained missing when the museum reopened.

The booty was taken when thieves rammed an SUV through the revolving door of the museum. One man held a security guard at gunpoint while two others took items from a display case.

Officials said the nuggets have not been recovered and no arrests have been made.

Wells Fargo officials say the company that has been in business 163 years can bounce back from difficult times.

"We are a resilient company," said Brenda Wright, senior vice president, manager of community relations West. "We are proud to re-open the doors to the museum."

Wells Fargo opened its first branch on the site in 1852. The museum has been in business for 80 years in San Francisco and more than 50 at the current location on Montgomery Street.

"It took a lot of hard work, continuous round-the-clock work," Wright said of the reopening. "The museum means a lot to a lot of people so it's kind of sad that people" would rob it.

At the re-opening celebration, Chairman and CEO John Stumpf said more than 100 groups of school children toured the museum last year.

When some heard about the robbery, they wrote him letters and a fourth-grade girl offered to help clean up the broken glass. She also wondered what founders Henry Wells and William G. Fargo were thinking about the brazen heist "up in heaven."

The reopening was held in conjunction with the start of a year-long, citywide celebration marking 100 years since the 1915 Panama-Pacific International Exposition in San Francisco.

The event was a world's fair celebrating the city's rebirth from earthquake and fire as well as the completion of the Panama Canal the year before.

Many Wells Fargo relics from the fair, including pictures, awards and old movie clips, are on display at the museum.