Hi Odin,
Hail mighty one!
There is a much easier way to get Raptor eggs, if you have a Warlock (or a Bard) with the level 3 Fiend spell of Summon Creature. Just cast this spell, and after a few tries you will call out some Raptors. Then, using a Rogue or anyone with Pickpocketing skills, just steal from them and you will get all the eggs you need.
The egg by the river will come back as well, but this is much faster.
The Scroll of Trickery will regenerate, I sucessfully made two characters Bards and they both got the scroll. Unfortunately, I had them both take the quest simoutaneously, but only one scroll was there. I had to have one take it to the guild, then went back and got another.
BTW, Bards are great characters for getting skills like Trickery and Fiend spells, not to mention getting the music trait (which you can only level up when you are a Bard, for some reason).
Good luck!
Scronan