Mine should run just a bit under that - I'm guessing about 24"x21"x47-1/2", if all goes according to plan (The box itself is 20x20x46").
Tim,
I'll bear the recommendation in mind. The original locks are bit different than the one's offered today, though. What I am really looking for is an iron crab lock, whatever that may be. I haven't really gotten into that part of the project yet - I'd just as soon leave it off, but all the originals seem to have had a lock and I suspect that the locks helped pull the lids down tight and bug-proof in addition to keeping unauthorized people out, so I probably should install one.