Unless you really need purebreds for a breeding project, or you intend to show them, or you just have your heart set on such-and-such a breed, you can have just as much fun and satisfaction from any ol' mixed breed or mutt you can hatch. So I'm all for getting grocery store eggs to hatch, or...
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That makes sense that the day-of-the-year number is the day they were packed, rather than when they were laid. The 'P' probably stands for 'packed'.
The facility code's probably that 4 digit number.
Getting some fertile eggs at the grocery or health food store is a great inexpensive way to test your incubator, or to use for a hatching project for the kids, rather than spend big bucks on shipped eggs that may not hatch anyway.
If the eggs have been too cold for too long, they won't hatch...