Without knowing exactly what documents you're talking about, we can only give a general answer. Your 2019 documents, such as W-2s, were only issued within the last month or two, so it shouldn't be difficult to call all the issuers and ask for copies. Also, many companies now put their documents online at year-end, so you could try the web site for any issuers and see if they have their year-end forms available online.
Even if you're talking about 2018 documents, you should still be able to call the issuers to request copies.
