Sears Lionel 11770 circus set

ok ,sort have got the feel of the forums now and how to ask questions ? The Sears Circus set #11770 supposedly has no numbers on the cars , however in my reference book it clearly gives numbers for the cars and engine .........The question is .......without numbers on the cars or the engine how can you tell a fake from the real set , I realize this isn't a premium set worth thousands of dollars but conversely I've looked at some very expensive sets ie. 400.00+ and pondered the same question even with id numbers........