I What Would You Have Done

Well odds have it; it was from illegal activity, and they may want it back. So instead of spending or turning it in. I would bag and seal the money some where in the house. If some criminal comes for it; they get it.

Now After three years to beat capital gains tax I would sell that house and move; if I had bought it. If I was renting the house I would finish out my contract and move. After I have moved I would use the cash to make regular car payments and to pay bills. If you put more than a $1000.00 down on a purchase without having a bill of sale for a car or big ticket item; invest, or bank deposit the IRS will see the money movement. Look into off shore accounts and the like; hide the money in those to avoid tipping of the IRS, or anyone looking for the money.

take the money and RUN

I'd think I was dreaming. Then I'd have to pray about it. Then I'd ask on SW but not mention it was me. Then I'd spend hours on Google trying to find out what to do. I'd also get a security system with good cameras in case somebody came to get it.

Invest it.