I haven't been into my store yet this week, but I wouldn't be surprised if the 52x was the sub. I'll come back and let you know in a couple of days, if not tomorrow.
It really depends on the management at the store if they want to give the sub or just tell you they're out. My managers are all about customer service and repeat business, so we give out the substitute everytime and usually we even let you use internet coupons in store.
Like someone else said, YMMV, but be nice and you might get it. If you get pissed off or try to do quite a bit of dealing, we probably won't give it to you.
Example: Guy comes in trying to use expired coupons and internet coupons on ~$200 sale if memory serves me correctly. We deny the expired ones because we'd get a nasty e-mail from corporate. We let him use the internet one, then he proceeds to try to wheel and deal with my manager. Finally the guy says "Come on man! I buy a lot of things at OfficeMax!" and my manager says, with a straight face, "Do you know what you're saying? Here, listen to this. I walk into a McDonalds, order 5 value meals, then I tell the cashier, 'Hey babe, can you make one of those free, I buy a lot of stuff here.'"
The guy quit trying to deal, just paid for the stuff, and walked out. After he left I burst into laughter, but my manager just cracked a little smile.