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I actually had a friend check it for me (Hozu here on Smogon) as I don't have access to instacheck. I'm sure he'd be glad to check the eggs for you if you'd like to message him prior to our trade.
It would appear you gave me the wrong egg; this one has a shiny value of 2307. Here's a screenshot of the one you sent: http://i.imgur.com/UMm2FM1.png I'll go ahead and give you this one back and give you a chance to find the correct egg. :)
I think the trade is pretty fair as is. If you'd prefer to not go through with it without a credit, I understand completely. If you'd still like the Manaphy, send me a PM on Pokécheck or a VM here and I should be able to trade at that time.