IMO, I'd send it back.
That stuff if loaded with soy and other stuff we shouldn't overload on. We weren't designed to eat out of packages.
Everyone I know who has done Medifast HAS lost a lot of weight, and then GAINED BACK EVEN MORE (and it's no fun sharing office space with someone who eats too much soy, ahem
I love SparkPeople because I have the POWER over everything I choose to ingest. No foods are off-limits, just as portions should not be "limit-less."