I Mailed A Title Back For A Used Car I Bought From A Kid On Marketplace Because He Didn't Sign It Properly.

So I recently (about 2 months ago) bought a 2003 Honda Insight as a fun project car / daily to help save me some money on gas (I have a 1 hour commute to and from work), This is the first time I've ever bought a car, so I had no idea what I was doing when I was looking at the title, it all looked correct to me but supposedly he had forgotten to sign in a few places, so me being an idiot I mailed the entire thing back to him so he could finish filling it out and send off the parts he needs to and I thought he would just send the part I needed back. It's been about 1 month now of him just telling me he just doesn't have time, and the past few weeks I've gotten no response. I have pictures of the front of back of the title with my signature and information clearly visible, but I just have no idea what to even do about any of this, any help is greatly appreciated!
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