Past tax returns when buying a property. How true are they?

[Joshuwa Hannum]

I have a 12 plex under contract and DD is almost over. It has been a long road to hoe. Getting all of the financial stuff was like asking my wife to wash my truck. They finally sent me tax returns and they are ugly, like my truck. They show half the income from the proforma and the rent rules. Expenses were were I would expect this place to be. So do I just chalk it up to they are crooks to the IRS and hid all the cash deposits? Or do I validate the returns and say look this property clearly doesn't perform like you say it will. I got a clarifying email stating the reason the income is at $32,000 is because it was mostly cash and the place just wasn't managed well.