My opinions:
(1) If you know it's authentic, there is no need to authenticate it again. However for big dollar cards that you are planning on selling, you should get it authenticated. You may also want to get it authenticated, if you are worried that if you pass on, your beneficiaries may have no idea what they have and sell your cards for $1 each at a garage sale.
(2) SGC/PSA/Beckett graded cards are taken as legitimate as long as the case never breaks with a couple of caveats. The TPG's usually use standard processes to determine if the card is real such as black light test (I assume they are dong this), and so forth. The caveats are, they are still human, and even the TPG's can make mistakes. However, as long as they are in business, they will usually always guarantee the grade and authenticity on the card, and will refund you if they are incorrect (like insurance). Of course, if they go out of business, that guarantee is out the window. The second issue is that although TPG's are usually good a determining authenticity, they can make mistakes in the grade or detecting alterations/trimming. This is more common. You can see many threads on this forum asking how that card received that high grade with the paper loss or marks, etc. Therefore, you often still need to go back to the proverb: buy the card, not the flip.
(3) If you sell on ebay, you need to slowly gain a reputation. Otherwise, many buyers may avoid you. Therefore, as you start out, it would better to list the items via Buy It Now where your list price is around the going market price for that card. You will still get sales this way as buyers can see that your items are legit. If you do need the funds immediately, then probably the best way is to still go through an auction house or large consignment shop that has many more eyeballs for your items. However, as with anything at auction, it may fetch lower than you expect or better, depending on whether the right bidders see your items. Good luck!
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