I'll believe this one. I used friend's addresses in testing a system years ago. It's worth having a "zoo" of addresses because they come in a dazzling variety

I'll believe this one. I used friend's addresses in testing a system years ago. It's worth having a "zoo" of addresses because they come in a dazzling variety of formats - Salt Lake City, for example, has 2 Temple Streets that run east-west, one north of the LDS Temple, and one south. So they have a "directional": 123 E Temple St N. Apartment numbers are also a problem Once you're done developing, the hand off to day-to-day administration sometimes leaves things behind. Test addresses might just stay in the system.