Registering handguns before selling (in Michigan).?

I have two handguns I’d like to sell (on consignment/to a licensed FFL dealer) but I’ve only recently looked at the laws in Michigan and I’m not sure what to do, or if I may have broken any laws.

Handgun #1
I used to live in Texas and received a handgun as a gift there. At least at the time, there was no requirement to register handguns. I moved to Michigan (Wayne county) several years ago and brought it with me. It’s just been sitting around and rusting but I could really use the cash now so I looked into selling. I was told by friends here when I moved that I didn’t need to, but NOW that I’m looking over Michigan law, I find that handgun registration is the law here! So I’m pretty sure that I need to register this weapon whether I sell it or not but I’m worried that there may be some fines (or worse) for having waited so long to do it. I can’t provide a bill of sale or a previous registration card for above reasons.

Handgun #2
I inherited from my Mom’s recently deceased fiancé. He had no written will but his other step-son (only other heir) told me he hated guns and that I should have it. I would like to sell this weapon too but am unsure if I need to re-register it first since I’m not the original owner it was registered to. I can’t provide a written Will or original registration (haven’t found it yet) but can provide a death cert. and I’m sure the step-son would vouch for me if necessary, if that helps at all.

I really want to do this the right way but am unsure how to do it. And I’m also a little concerned about getting a felony or something just for (stupidly) not filling out a form on handgun #1 years ago, so I’m reluctant to ask local law enforcement first. Thanks for your help.

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Procedure for filling out an 03 FFL for an out of state student?

I am a student in Kansas, but my license/car is still registered under my mom’s address in Missouri as my permanent address, as is the norm for students studying out of state.

I wish to fill out an 03 FFL for Curios and Relics so I can pick up a few milsurp guns to plink with on weekends. Nothing illegal about owning and storing them where I currently live.

However, under what address do I fill out the FFL? My current apartment address in Kansas or my permanent address in Missouri? I assume that if I have to fill out my form under Missouri, that I’ll have to have everything shipped to my moms place and then just make a trip to her place to pick it up?

Also, who exactly is the "Chief Law Enforcement Officer" that I have to give a copy of the FFL to? Local sheriff?

Thanks for any input!

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Texas Gun Laws,is it legal to put a gun in your car with out a permit in The state of texas is there a website?

Does anyone know if it is legal to put a gun in your Glove Box (The compartment in front of the passenger seat) with no permit. My Mom runs a lot of errands by herself and we live in Dallas and I think it would be a good idea.