I just got done reading "United States Proof Sets and Mint Sets". The authors caution about buying proof sets in original packaging, per se, 1950-1954 and 1955-1964. And especially sets prior to 1950. They say there are a lot of fakes out there. How does one guard against this? Personally, I don't like sets that have been put in plastic holders and would prefer to collect original packaging. If the 1950-1954 set is in the box and the cellophanes are still stapled together, is that pretty safe? If the 1955-1964 in the envelope with the cardboards and piece of paper and the cellophane looks untampered with a safe bet?
Doug, The only problem with the original sets as they were issued from the mint is in the packaging itself. These were not constructed well. The cellophane came apart quickly, and often leaves a very unattractive toning on the coins. In 55, they made there first real gain in this area. The proof sets have made leaps and bounds since the 60's. As far as fakes, you can't fake a proof coin. They may put the sets together, but they are still proof coins. There will always be people that will take advantage of others. All we can do is learn what we can, and be take advantage of this information.
Douglas - Before spending your money in the early 50's sets it might be wise to look at quite a few first. The little square boxes as well as the cellophane itself has a distinctive look - they were made in a specific way. It has to do with the way the cellophane was crimped. And the majority of the time the staple holding the 5 cellophane sleeves together will look quite old and or be rusted and have signs of at least minor corrosion. It is the staple in some cases that is the cause of the unatractive toning National dealer mentions. Anyway - once you look at enough genuine original sets - you come to be able to recognize the real thing when you see it. Of course it also helps if in the beginning you purchase these sets from a trusted source whether be a dealer or a friend. You should also be aware that there are counterfeit flat pack Proof sets made too. I have seen some '54 sets in these flat packs - not the real deal for they did not make the first flat pack until mid '55. Again it is the crimping pattern in the pliofilm that gives it away.