この間 can aslo used for your co-works or boss. But I feel 先ほど is a bit politer.
先ほど is difficult to tell. Someteims it means a few minutes ago, sometimes a few hours ago, or several days ago ...anyway ealier.
We also say さっき in a casual way.
There aslo words to mean ealier. 先ごろ. せんだって means sometime ago in alc dic.
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