^Believe it or not, places can serve more than one purpose. Just because theres nothing in there now doesnt mean it wasnt used for cash register training in the past. Are you also aware the Shrek building used to feature a different attraction as well?
I've always been one to stick up for you, but you've got to cool it with trying to prove everyone wrong here, man. I have seen the building used for merch training in the past, as have many credible posters that are wayyy on the inside with Universal. Trust them, theyre right about what it used to be. It looks like they cleared it out, and thats a neat picture. But that doesnt discredit everyone else's statements.