1.Immigration related materials:
-first 3 pay stubs
-last 3 pay stubs
-all the past W-2
-employment verification letter (if applicable)
-all the past H1B materials (submitted materials and approval notices)
-all the past I-140 materials (submitted materials and approval notice)
2.past experience/performance:
-all the past performance review docs
-all the past impactful projects
-contacts of all the close colleagues