I have used those containers. I buy the ones that are about 5 inches deep and have the flat lid. Then put the cake with the board on the inside lid and put the container on top. It really protects the cake very well. Sometimes it's not the best looking but, if your goal is to get a large cake from one place to another, it works great.
have you thought about just using large boxes?? uline has some nice white boxes that wouldn't look totally like you pulled out a shipping box and stuck a cake in it.......then you wouldn't have to worry about getting them back either!!!
http://www.uline.com/Browse_Listing_425.asp?desc=White+Corrugated+Boxes
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