Ethical question: larger deposit returned

[Matt Liu]

I had a deal fall through due to the seller's poor title. After I spend 300 on inspections. The agent sent me back the deposit, double what I paid by mistake. I feel the right thing to do is tell him and send him back half. However I also feel a little like I got burned by the deal wasting money on inspection because they didn't do their research prior. What do I do?