In 2013, German authorities discovered more than one thousand pieces of artwork hidden in the Munich apartment of an elderly recluse.

Understand the Problem
The question is asking to identify the participle or participial phrase in the provided sentence regarding the discovery of artwork in Munich. To solve it, we will analyze the structure of the sentence to find the relevant phrase.
Answer
'hidden in the Munich apartment of an elderly recluse.'
The participle or participial phrase is 'hidden in the Munich apartment of an elderly recluse.'
Answer for screen readers
The participle or participial phrase is 'hidden in the Munich apartment of an elderly recluse.'
More Information
This phrase describes the location where the artwork was discovered, using 'hidden' as a past participle.
Tips
Ensure you identify the past participle in relation to the noun it modifies.
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