Officers set up a second cordon around Dean Street on Tuesday, following the removal of the half-tonne device the night before.
Staff in nearby offices posted further videos of the evacuations on Tuesday.
"It's a little disconcerting that we were allowed back in the building so soon after yesterday, not to mention the fact that it's been there for over 80 years," they added.
Police closed down the areas surrounding Dean Street, including Old Compton Street, Carlisle Place, Bateman Street, Frith Street, Saint Anne's Court and Wardour Street.
Evacuations took place in Dean Street,Richmond Mews, Meard Street and St Anne's Court.