That was my practice many moons ago when still married.
I wouldn't give my (now Ex) the combo to either safe just in case (SMART move on my part considering the divorce) but every so often she'd peek in when I'd open the door.
Then, after seeing my, um, "collection" and the safes being more crowded, she'd ask when I got this or that. I'd just reply "They had babies" and let it go at that.
I had an inkling what was coming down the pipe so any new acquisition would be brought in at Oh-Dark-Thirty when all were asleep (one benefit of working a late second shift I suppose).
To this day she STILL hasn't a clue how many guns I (don't) have. Heh, heh, heh.
THAT, my Friend, is the key to a Happy Marriage and, better yet, the key to KEEPING what you bought over the years of marriage.
I don't even feel bad at all. After all, it cost me ENOUGH to get unmarried to her and she emptied my wallet many other ways.
But I got to keep ALL my guns (that later drowned a terrible death in a canoe accident. 200 miles off the coast of Alaska. In a BIG storm where I even lost my GPS. LMAO!!)
I can relate. With my first wife I bought the exact same rifle just in a different caliber so they looked a like. Then I never let her see the two at the same time.