Hey,
I was just thinking to offer a little help maybe...first there's no need to worry sharing the public address because it's impossible to have the balance stolen without the mini private key on the inside of the hologram, if you were to sell it here you need to prove that you've got the coin and share the public address in order to get a valuation but your coin is not graded, you won't get much in premium...selling the coin through escrow is not that easy because if you'll do it through a member who hasn't got rep, you'll end up by losing the coin forever and not getting a quid for it, rep member you'll have to pay some fees and send the coin to him for inspection and then he'll send it to your buyer, it does take a while, if you need the funds ASAP, not a good option. Regarding how to redeem the BCH and BTG from a Casascius coin at blockchain, I would really like to start a thread about that or if someone knows about one in the past link it here. If you'll sell it through eBay, absolutely no PayPal especially if you want to deliver the goods to your buyer as you've stated in your eBay listing, chargeback as soon as you've left the place...consider bank transfer but you'll have to wait up to 12 midnight to make sure that your buyer won't report fraud on his account causing the bank to temporarily lock your account pending fraud investigation after you've given him the coin and maybe loosing the funds because it's hard to prove that you've sold him goods especially BTC, I've lost a lot of money due to a scammer who acted like this. Only option in my opinion is to sell it for whatever you'll get on eBay and I'm sure that your coin will get a lot of interest and take cash only with the buyer collecting or meet in a public place for exchange but keep in mind the 13.2% eBay and PayPal fees or.... redeem it yourself and try to sell it in person, use localbitcoins for cash transactions, it will be a little difficult as a newbie but you'll sell it. Always watch out for scammers in the crypto world because man is full of them,

Cheers