Thanks for all the comments. I'm glad people found these interesting.
Mitch, the garden area is only partially covered, so the adults are free to come and go. The nest is sheltered by the stuff stack on the shel above. I didn't ask about the pellets, but noe of the employees I talked to mentioned them, so it must not be too much of a problem. Or maybe they will have a big surprise when they move those pallets after the chicks fledge
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Marcy, that's very interesting. The store here isn't actively publicizing the owls, but they don't seem to have any problem with people taking pictures. The nest is visible from the check-out area and the clerks enjoy talking to customers about them.