for Dell make use of the service tag
and express service code
which should be stickers on the underside of laptop. Plug those in at support.dell.com to look up the laptop info/specs/warranty.
I know on Dell stuff, laptops or desktops, you go into bios and what it shows as the serial number is the service tag
number and the service tag is unique for all dell equipment... for example my e5530 laptop has whatever service tag whereas your identical laptop will have a different 5-7 character service tag.
supposedly the express service code is the base-10 representation of the alphanumeric service tag.
dell latitude e5530 motherboard
or disassemble the laptop?