I only have 2-3 mags for most of my pistols. So they are always with the gun they fit.
...same goes for my rifles
My Grandson grabbed a 9MM mag off the tailgate one day and slipped it into my .40. When he fired it sounded like a very light load but the bullet travelled a number of feet and the case, forward half, fire formed to .40 diameter. Given the fact we have a large number of each ID marks are well worth the effort.
And Todd, we only use a little bit of glitter but never with mauve polish.
The problem I have is the guns and mags are in the mid size gun vault and there isn't a lot of real estate inside.