Ok, I'll answer here and in PM.
You're getting referred to me because I recently went through the process of taking my collection, which is respectable in size, and changing it from being registered in my name only to joint registration with my wife.
For longarms, we hauled them down in lots of 4 or 5, that being as many as we could easily manage at a time. She had to take her Permit to Acquire and we had to have the original registration and a certified copy of our marriage license. Each gun was passed through the window, inspected, matched to the original registration. For her use, they created new registration forms. For my use, they typed on the original registration forms, adding information.
For handguns, she was required to fill out an application for a Permit to Acquire for each gun. For that step, we did not need the guns, only the information you would normally take to HPD. Then we waited two weeks. After two weeks, we loaded all of the handguns into a couple of very heavy duffel bags and went back. Again, she needed her permits, I needed the original registrations, and we needed a certified copy of our marriage license. Again, she got fresh, new forms, and my forms had additional information typed on them.
For the handguns, HPD opted not to inspect the actual firearms. This pissed me off, because we had manhandled those two heavy duffels up there for no reason! I wouldn't count on having that happen, though; I think the guys behind the window had just gotten tired of seeing us!
So now, for each gun, we have two registration forms. Hers are nice and neat; mine have typewritten info crammed in the margins.