Answer:
participle
Explanation:
There are three verbals; they are gerunds, infinitives, and participles.
In this sentence, we see the past participle found, which is used to make the present perfect passive form of the main verb find. The words has been help to make this tense form; they are part of the complete verb has been found.
Technically speaking, been is also a participle; it is the past participle of the verb be. However, in this sentence, be is only an auxiliary verb used in its participle form to make the present perfect passive form of the verb find.
