Use "in" whenever you want to mention just being inside an enclosure
Use "at" if you refer to an activity performed in an enclosure
However, many times "at" is associated with certain words or expressions and "in" to others, therefore, "at" and "in" are not always interchangeable
bibliography: http://menuaingles.blogspot.com.es/2007/10/preposiciones-v-at-in.html
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