Comic Book Boxes – Weight

I'm trying to make the most of this pandemic by organizing my various comic books. So, I'm putting up some more shelves to store boxes and make it easier to sort through things and box them up. Here's a picture of the mess I'm starting with.

Here's the "before picture" of the mess that needs sorting out.
And this is just ONE of the tables and areas that need help!

One thing that I need to be mindful of when buying the shelves is that they be strong enough to support the books. That means, of course, I need to know how much a short box weighs. Rather than try to sort it out myself, here's what I found after a quick google search:

• Long box, old style that was thicker, one comic per bag and board, 211 comics, 38.24 lbs.
• Long box, new style that is thinner, 2 comics per bag/board, 348 comics, 60.25 lbs.
• Long box, new style, 2 per, 353 comics, 59.04 lbs.
• Magazine box, one comic per mylar bag and board, 148 comics, 31.79 lbs.

Short boxes vary:

• Short box, new style with old comics, about 22 lbs.
• Short box, new style with new comics, about 25 lbs.