I'm actually not surprised by the cash thing. OP is likely a small business owner... probably a restaurant owner. You know all of those little places that are "cash only"... Everyone knows they lie on their taxes.
Cash = no trail = claim whatever you want to the IRS. Gotta keep the money out of the bank or you'll fail your audit. These people buy houses, cars, etc with cash.
My GFs neighbor is a small restaurant owner and not-surprisingly their house is the only one that gets broken into over and over again.