RMS protected e-mail search

Hello,

is it somehow possible to search only RMS (OME) protected email messages or messages which contains RMS protected attachments. In "Security & Compliance -> Content search" did not find any conditions/query to achieve this. In "Content search" I can select:

But this also will display all messages which contains for example audio or video files in attachment.

Probably someone have some solution to achieve this to search only protected messages or messages which contains protected document?