def _has_vmedia_device(managers, boot_device):
    """Indicate if device exists at any of the managers

    :param managers: A list of System managers.
    :param boot_device: One or more sushy boot device e.g. `VIRTUAL_MEDIA_CD`,
        `VIRTUAL_MEDIA_DVD` or `VIRTUAL_MEDIA_FLOPPY`. Several devices are
        checked in the given order.
    :return: The device that could be found or False.
    """
    if isinstance(boot_device, str):
        boot_device = [boot_device]

    for dev in boot_device:
        for manager in managers:
            for v_media in manager.virtual_media.get_members():
                if dev in v_media.media_types:
                    return dev
    return False