Could you tell me why ''occupé'' and ''reposé'' are not infinitives in these 2 examples. j'ai été très occupé and je me suis enfin reposé

Hi Colin,

You would only use the infinitive as a second verb in the same clause but here we only have one verb in each - 

and 

which are conjugated.

So occupé and reposé are past participles.

Let me know if I need to explain further.