The sentence "I don't know the whereabouts of any given employee at any given time" is somewhat ambiguous and can be interpreted in both ways you've suggested depending on the context. However, without any additional information, it most commonly implies:
- I am not aware of the location of any particular employee at any particular time.
This could mean that the speaker isn't expected to know (your interpretation 1), or simply that they don't know (your interpretation 2).
On the other hand, the sentence "I don't know the whereabouts of any given employee" without the time clause generally suggests:
- I am not aware of the location of any particular employee.
Again, this could be because the speaker isn't expected to know, or simply because they don't know.
In both cases, the speaker is stating a lack of knowledge about the location of employees, but whether this is due to expectations or lack of information would depend on the context in which the statement is made.