I usually keep 1 box for each company. But if it is like
signed or kinda unique id keep it like my jensen,chuck and chris
signed canvas box or shakeel sig on my stalker 2 box. 
I keep the boxes mostly because I put my string in them, if I don’t need them i throw them away. I sometimes keep the boxes I get from yoyoexpert or any other online store to reuse if I need to ship something.
Yeah, I got a whole closet full of boxes of various shapes. haha
literally boxes filled with boxes
I keep every box.
Having the box increases the value of the yoyo if you decide to trade or sell it and it’s not hard to hang on to the boxes.
I always keep the boxes. I have two whole dresser drawers dedicated to nothing but yoyo boxes.
I keep some of my boxes. Like yyr or clyw I’ll keep. The plastic yyj, werrd, etc ones though I chuck.
You guys know boxes are collapsible, right?
They collapse, but keeping a lot of paper stuff around draws bugs and stuff. That’s why I keep my limit. Not ideal for me to keep a lot of clutter around. I look at how much a buyer might want to pay for the same yo-yo with the box, or without, and it’s not a noticeable difference to me…or enough for me to keep it in most cases. I don’t sell yo-yos very much at all, so no need for most boxes.