You work for the alphabet boys?Every company policy is different. Dont take anyones advise unless you specifically know how the company human resources vets its prospects.
My company hired a third party background check and the company requested w2s to match salary and job title as verification. They even haulted my on boarding because i listed my job title as something different they had on file. They used how much income stated i made and my w2 to calculate how much time i worked for the company based off the numbers.
College transcripts were verified to make sure it stated Degree Awarded and they contacted the degree verification or whatever it was.
Depending on the job, they are def checking work history but i can see how some lower paying jobs may just take your resume at face value.
I know for a fact that's what they do, very thorough.

The system is corrupt in Life