I’ve been remiss. Here are my crates; not as fancy as Bob’s. No tabs. Cut out and clue around a block of wood. Labels from the other sheet. I cheated, no bottoms.
www.jbrr.com/Pics/RollingStock/Boxcars/Ventilated/crates.pdf
When I cut these out, I make a very light cut along the bend lines. This makes for an easy fold.