Storing Uncirculated Coins In Dealer Supplied Flips

Sally, it depends on the type of plastic the flips are made of. The ones that are soft and pliable have plasticizers that could affect your coins. The ones that are stiff but flexible should be ok. I wouldn't store coins in contact with printed cards, however. And it's probably a good idea to rinse the coins with acetone.

This isn't RAM-official packaging; it's from Sherwood Numismatics (a now-defunct branch of the Downies empire), so it's basically a dealer's wrapper. Long-term storage was not high on their priority, so a Sherwood holder that actually worked for long term storage is a happy accident, not by design.By the looks of that coin in that flip, this is not an example of a happy accident.

RAM packaging these days is usually of higher quality and won't react with the coins directly as this Sherwood wrapper seems to have done, but some of their products offer little to no protection from the air (such as the privy-marked dollars in those little flip-cards). Basically, when considering long-term storage, if you can see the coin or parts of the coin directly exposed to the air, then consider either taking that coin out of that packaging and put it in a 2x2 or similar, or put the entire coin-inside-the-package inside some kind of airtight bag, box or container.

If you want to keep the Sherwood folder, I'd recommend taking it out of that flip and putting it in a brand new fliup that you know and trust will not do that to a coin.

Yes,for long term storeage use stainless staples.

As an aside I purchased a bulk buy a few years back and many of the Coins were stored in saflips type of plastic holders,these had a tongue that tucked into the holder.
Where the tongue touched the coin there was a mark that had stained the silver coins.

Lesson learnt.