Just started trying out dry boxing a couple weeks ago.
Due to my anal organisational method, some dry box for only a day, while others get several days.
Rh in my room is 55 to 60% steadily, and I store everything at 65% in my tupperdoors, so they aren't drying out by much.
Still haven't noticed any difference yet, but haven't had many of the ones that have dry boxed for several days.
Will continue doing it though as it works out for me organizationally, and most people who dry box say it definitely improves them in a few ways.