Illegal connection

Do you mean house box? Everything is encrypted so nothing is really “illegal”. Does she live in a duplex or condo or something similar

No in a house in Lynden. There's a metal box close to the garage doors, & until yesterday I never saw any type of a long black coxial cord or any type of metal box along side of her house, then the coxial cord connects to the neighbors metal box along side of their house. Is it true that the installers did this Do to that the line has to be replaced or they didn't have enough time to put the line underground??

You would need a tech out to accurately answer those questions.