Indeed, the announcement indicates fortified metal corners, which is not the case. But thanks to the photo of the item and customer feedback, I knew what I was buying and boxes are perfect for the price at which they are sold. I also confirm that these boxes arrive in veeeeeery graaaaands packaging ... If these boxes are thick and I think they will live to what we want to do! Another downside, we're going to add two pieces of tape to hold the assembly. If you would like to use "intensive", it can be a problem.