somebody had already

English as a Second Language English Vocabulary, Grammar and Idioms
1

[color=red]1-Somebody had broken the lock at five o’clock in the morning.
[color=indigo]2-Somebody had already broken the lock at five o’clock in the morning.

[color=red]3-At five o’clock in the morning somebody had broken the lock.
[color=indigo]4-At five o’clock in the morning somebody had already broken the lock.

Could either of these sentences have this meaning:

Somebody had broken the lock before five o’clock in the morning.

Gratefully,
Navi.

2

If you say ‘at a certain time’, this means that was when something happened. If you use already (having a suggestion that something has/happened before) and refer to a time, then you would have to say for example ‘by five o’clock’.