There's a house on Fairmount, near Tufts, that has a backyard piled high with hubcaps. I don't know if the person has a legitimate hubcap-selling business (maybe on eBay?) or is just a hubcap collector or hoarder.

You can see the backyard full of hubcaps from Capen St. E. on the Tufts campus if you look down the hill.