I had the same question when I started work on my ‘mirror’ earlier this summer. I had purchased a HP monitor and found a link for 3rd party recyclers to properly disassemble and recycle the various monitor parts.
I used the same search term (except Dell not HP) and found this:
Dell Monitor Disassembly
Thank you, 24h after my second email I got a perfect disassembly instruction. Unfortunately, the pdf is to big to upload it here.