I think it's perfectly fine. The expiration date of pharma is the date the manufacturer guarantees the product will be good until. It's permissible for that date to be years, even decades prior to the actually lifespan. The FDA doesn't require manufacturers to determine how long the product actually lasts, provided it's at least as long as that date.
2 years, like Hospira BAC, is a good sign they've chosen an arbitrary, default time frame, for commercial reasons, and it's not a real limit.
Knowing what I know the nature of the Hospira BAC and its packaging, I wouldn't think about it being compromised for at least 5 years, 3 passed the date,, and likely longer.
During a project to determine the real lifespan of drugs conducted by NASA, for the international space station, they noted Sterile Water for Injection had expiration dates from 18 to 60 months, depending on which country it came from.
