Die Hard (1988)
Boom mic visible
Crew or equipment visible
Errors in geography
Incorrectly regarded as goofs
Answer: It's the floor directory. Takagi and Holly don't work on that floor, so their names aren't on it.
Apparently, that's how the lock works. Theo mentions that the power cannot be turned off locally, so even if the robbers shut the building's power off, the electromagnetic lock would stay on. Presumably, it's on a separate utility line which can't be turned off from the building easily. It only turns off when an entire power grid is cut, after all.
$640 million dollars in such bonds would likely be size one or two reams of paper. It certainly wouldn't the massive shower of forms that comes raining down from the building in the end. It could be carried in a briefcase or small tote.