I-9 verification mistakes that get startups audited and how to avoid them (almost got hit)

our I-9s were a mess for 18 months and we didnt know it. hired 6 people. figured wed just collect the forms and move on. turns out we were accepting expired documents, missing section 2 signatures, one form was just. gone

auditor request came in for a completely different reason and suddenly everyone is sweating

doesnt seem like a big deal until it is. anyone dealt with this