[SOLVED] What are the "missing" parts on my DELL Latitude E5470?

[CactusLone]

Hi

I bought this second hand. Yesterday I opened it and I noticed a few parts are missing. Please help me

1. Identify what are the missing parts.
2. Are the said parts necessary? Should I add them?
3. I want to get an internal hard drive to ADD to the existing SSD one. Is there a slot available for that? What specific model should I be looking for to fit my laptop?

I'm no tech savvy; please be thorough in your explanation. 😓
Thanks in advance

https://imgur.com/nIf8t8C

View: https://imgur.com/nIf8t8C

 

[SkyNetRising]

1 - spot for WWAN module. Not in standard configuration. Not essential.
2 - spot for additional DDR4 SODIMM module.
3 - is just space for larger battery pack. You're not supposed to put anything there.

If you remove 2.5"sata drive, M.2 drive can be installed in that spot. But you have to chose one or the either.
Doesn't seem to be possible, to install both.