Got two from 500 West Center in Provo tonight for an autio parts junkyard. The name of the junkyard may not be the same as the company that put up the spams.
The company is called 'Pull and Pay' and offers parts pulled by the three people involved and delivered to you. The warranty is crap, 5 days, but that may be par for the course for these places. Spam verbiage also indicates used tires are also sold, unclear if they're retreads. They claim to give quotes over the phone.
Spam is typical full sheet of paper with pulltabs. No street address is given, uses tape to separate the tabs from the rest of the sheet. The names of the three parties involved are Bert, Cameron, and Dave.
The only way to contact them is by phone. It might be possible to do a reverse phone number lookup but given some things with the exchange that might be hard to do. That was 801-471-5829, and that generally is from a pool of numbers that Sprint gives out numbers from so it might be either a cell or landline, just which is not clear.