1. when would or when will - would is more polite 2. where would (if he usually hides them) or where might otherwise.
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AnonymousMe: When would he be free? I need to talk to him.When will he be free? is my choice. When might he be free? is possible if you want something much more formal and deferential.
Secretary: I think you can meet him next week.
Me. Thanks.
AnonymousMe: Where would he