Help with locating additional fuse box

Hello, I have DS7 2018 2.0 diesel, opera trim.
I bought car few days ago and previous owner told me that both heated seats stopped working suddenly a month ago so I wanted to check if it is a simple fuse replacement. I found out that it should be in “additional fuse box” that should be next to majn fuse box but when I open plastic on drivers side there is just one fuse box rhere. Any ideas where to search for this additional fuse box?

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I hope s1 can reply. My massage seats stopped working. Also looking for this box. I think its behind the main box. But i dont know how to reach it