this is a very basic Duty box. Use an exacto knife or similar to cut apart. Do not try to pull apart without doing this or the Box will fold where you do not want it to. And even at that you have to be very careful when assembling so as not to bend the Box where it's not supposed to bend. If successful it is a fairly substantial box when assembled. However the slightest Bend in the sidewalls greatly diminishes it's sturdiness and durability. For the price it is a decent box. Would recommend for light duty.
I love it when I get these on sale. They're maybe a tad thinner than the Banker's Box brand but every bit as durable and effective. Plain boxes that you have to tape don't hold up this well - their integrity is helped by the lids plus you get hand holds!