I've cleaned for one of my customers for 5 years, 2 or 3 times in a year. My daughter pet sits for them every year at Christmas. The last time I was cleaning they said "they love to watch my daughter play chase with their dogs in the house, it's so funny." "we have hidden cameras all through the house"
Always act like you're being filmed in a home. Never know.
Only things I ever take is at empty student housing, just things that are destined for the dump. I get lots of good vacuum cleaners. I pass them on to a to a local project that helps single moms with housing, training and jobs.
The students dump so much usable stuff it's a shame. We do have professional dumpster divers. Last year spotted one driving a Lincoln Navigator. They take stuff to auction, yard sales and ebay.