All the guns in our house are mine/ours. I don't need proof from the MSP. Most of the 4473s I have you can't even read since they are the bottom carbon copy. It's just dark smudges on a pink piece of paper. Pretty much worthless.Keep the 4473's that were filled out for all of the firearms. With regards to handguns, if they were transferred in Maryland, then do a PIA request to MSP for the firearms listed as transferred to you and have your (now separated) wife to do the same to prove ownership.