I have a very large sheet cake to transport. However the cake boxes I have found in the stores are not big enough for this cake. Any suggestions on how to cover it without messing up the cake?

you could ask at a bakery if they would sell you a full sheet box (19x27)
theres a slim chance one will.

otherwise i have dropped a side on 2 boxes and taped them together then covered the top with clear cello wrap.

I think I might have to try the 2 cake box thing. Never thought about that. I see you're in Denton. Not too far from me. Thanks for the tip!