What to check when buying a used Xperia Z5 - Xperia Z5 Q&A, Help & Troubleshooting

Hi all,
I'm going to buy a used Z5. And I know if unlock bootloader on Xperia device will also lose the DRM keys.
So, I would like to know what and how should I check if the phone still has its DRM keys?
And is there anything else I should know before I buy the used Z5?
Thanks.
Edit:
I found out to go service mode dail *#*#service#*#*
Then service tests>security
All keys should display ok and activate

I dont exactly remember which service menu it is that you need to check
But ive found that if drm content isnt active then the screenshot below
Would only show one image rather than two
(settings>display>image enhancements)
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Sent from my E6653 using XDA-Developers mobile app

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"lightbox_thumbnails": "Thumbnails",
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