I agree with Chicksooner, you should candle on day 7. The one I have in lockdown (bless his/her little beating heart) is one that I was not positive on according to my notes on each egg. If you're not sure what you're seeing keep it in. It's all a learning experience and you won't repeat any "mistakes" you may have made. Your research is not for nothing, I've no doubt that you've already helped a lot of people just by this thread alone. Me included!
I think shipping of eggs is very hard, much harder than I thought, although that doesn't mean I won't do it again. I'll just be a better buyer from now on. Next year my JG's will be mature enough that I can try with my own eggs and then do a comparison on my hatch. They are laying fertile eggs now but they will only be 7 months old next Wed so I was thinking that they just are not old enough yet (the eggs are still a little small to my thinking). There's a Kindle e-book I bought for 99 cents that has been a great help to me through all this. If you want the name of it let me know.