By my calculations, you will need roughly about 1,520 seal scrolls of pulling in treasures that give itachi frags. This is based on a loose rate of math that you will get 1 itachi frag for every 38 seal scrolls. I arrived at this conclusion based on personal record keeping. This also takes into account for the variance of getting either 1 or 2 frags per 60 pulls.

So get to saving, chop chop! Good luck!