Government employer requires verification for direct deposit document

Since I don't have any checks from SoFi because I'll likely never need a check from SoFi, I don't have any to give to my new employers HR department, but their alternative is a document of direct deposit verification. I have no clue how to find this and none of my previous employers ever needed any because my account and routing numbers were good enough. What should I do or where should I look for said documents?