A lil rot can set in inside occasionally. Sometimes they'll still be plenty of good flesh still available, though this one looks pretty pervasive.
If you open any more of these, don't hesitate to get a refund. The more stores know we demand quality produce, the more careful they'll be in what they stock.
I got two that looked like that out of 5 pounds of mangoes. So I think I got my money's worth.
I just composted the gross looking stuff :)
Thanks for the insight.
That's a fair trade. One of few curses attendant to the many blessings of fresh fruitas :)