Docs to get after visa approval

I am in US right now with L1B visa, my new employer filed H1 for me and it got approved. I know I can start working for my new employer from OCT 1st. My question is, “What are all the visa documents that I should get from my employer?” Should I get the originals or soft copy is good enough as a proof to show I have got H1B? Since I am in US right I need not stamp the visa on my passport. So want to make sure I collect all the docs regardng my visa.