If you bought your fresh chicken already packed from WF in Chicago there is a big chance that it was from MILLER in Indiana, a group of local producers that sell their chicken fresh as "Amish" chicken under the name of MILLER.
By the way you find the same brand at Treasure Islands, and for less money at Fresh Farms in Niles. They also sell bresats, and thighs, as well as drumsticks already pre-packaged.
Since I was myself always surprised by the relatively long shelf life that is printed on the label I send a mail to MILLER to find out if it was normal for their retailer to sell chicken that has been kept in their fridge from 5 to 7 days.
To my greatest surprise, MILLER answered that it was perfectly OK and that nowadays their methods for killling, handling, and packaging allowing them to insure a longer but safe shelf life cycle.
I found out that MILLER delivers 3 times a week at WF, Once a week at Treasure Islands, and at least 4 times a week at Fresh Farms.
You should know that the labels and price tags that you find on these packages have been applied at MILLERS not at the point of retail. The retailers agree with Miller on the price and supply the labels. So there is actually no local packaging at WF.
As far as I am concerned, I buy only fresh chicken on the day when I know that it is delivered to the store and roast, broil, or bake it the same day. It is normal to find some redish liquid (water and blood) in the package or plastic wrapper.
I would never, however, keep an open package of fresh chicken in my fridge for more than 36 hours.
By the way, whenever I find it, at Treasure Islands most of the time, I prefer BELL and EVANS that has a very short shelf life of 3 or 4 days ( for breasts or thighs) but is air-chilled and offer, to my own personal taste, a better flesh structure and taste.
I would throw away any chicken with a slimy liquid in the package, and with the faintest of odor.