I've picked up a few single proof coins, that have come cut from sets. One is in a thin flexible pouch, the other a harder clear plastic. These are French coins, if it matters. For purposes of photographing them, I need to remove them from these holders. It's a one-way deal, I won't be able to seal them back up after. Is there any reason not to do that, given I will probably send them in for slabbing at some point? Will the TPG be impressed if I've maintained the original packaging, and offer a higher grade because of it? Or worse, not call them "proof" because they aren't in the mint's packaging? Thanks
Yankee is right, the TPGs want the coins submitted in flips, but I would offer this word of caution: Due to their extreme reflectivity and strong strike, proof coins also show the slightest mishandling and if not handled with delicacy, will show evidence. This evidence will result in a lower TPG grade later. Other than that, there's no reason for you to be afraid to open them up, they're only coins. I carry a proof coin as a pocket piece. Granted, the coin is now a diminished proof (in grade), but the conversations it starts are well worth the world's loss of one single pristine proof coin.
I'm not familiar with packaging on French proof coins, but you might be surprised to know that, at least for US coins, most if not all of the hard plastic holders the coins are shipped from the mint in can be opened and resealed. But, the point is moot, since you're submitting them for third party grading. If you're concerned about damage in transport, IIRC, NGC will allow you to submit coins in capsules, so you can use Air-Tites if you want.
Is it worth grading? Not too familiar with their proofs, but if it's modern with a relatively high mintage (ie in comparison with other proofs from the country or with world coins in general) you might be better off using the grading fees on purchasing more coins. As far as taking it out, sure why not. I've had similar thoughts that leaving US mint state coins in their cellophane package might help others believe it is in fact uncirculated, especially if there are contact marks that resemble wear. As for proofs (a different strike usually quite apparent), there usually isn't confusion about a coin not being a proof once it's removed. The only thing that matters is how much imperfections or handling marks are on it, and this is with the coin either way.
