https://chicago.craigslist.org/nwc/b...760980969.html
https://chicago.craigslist.org/nwc/b...760973656.html
https://chicago.craigslist.org/nwc/b...760964820.html
https://chicago.craigslist.org/nwc/b...760948270.html

It sounds like it's Bob's son who has these.