I purchased 10# whole brisket yesterday out of the case. Sticker has sell by date 8-2-15. But as of today, there is some spots turning a brownish color. I find it odd that it's turning when it's cryovac sealed with a date 2 weeks away. I was planning on cooking SATURDAY. Is this ok, I can cut it off and there will be that nice red meat? Or bring it back? If that's even possible.