WiFi piggybacking illegal?!?

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One of my neighbours has a really long range unsecured wireless access point, and she seems to run her entire business within unsecured Windows shared folders with public write permissions. Happens to include many credit card numbers, with names and expiry dates, that are unfortunately very hard to miss.
I have, on more than one occasion, accidentally snooped in that stuff. (Computer unexpectedly connected to her access point instead of mine, I went browsing in what I thought were my shared folders and found credit card numbers).
Nobody can gather the courage to let her know...