On a random mailing list there’s a report of an EE broadband box being delivered with a QR sticker on the side.
Which when scanned gives something like :
SN:J32xxxxxxx;MAC:88-03-55-xx-xx-xx;USER:admin;Pass:xxxxxx;SSID:EE-BrightBox-xxxxxx;WPA:xxx-xxxx-xxxxx
Guess that makes it handy for the postman to use your broadband.