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As a general rule the best thing to do is to contact the manufacturers when you know who they are. With Whitman, they have a web site and many toll free numbers. Contact them, describe what you have and ask if those contain PVC or anything harmfull to your coins. If you don't trust what they will say, mention your having this conversation recorded. They always say that. As to any holders for coins, attempt to always know who made them and to the same. I've found recently many 2x2's are now being made in China. None of these are in boxes and all bulk sold at coin shows. Not sure how many are sold on line by on line dealers though. Also, difficult to contact China and ask them anything.
If in doubt, rather than trying to figure out if safe or not, just redo with newer, name brand merchandise. I know it may sound expensive but as I always say, better to be safe than sorry.
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