It's good and bad, but, I think it's so common and they know it's a common occurrence that happens more times than not. They're likely not losing money, because, they discover the overages. I've had to return to the store for items more than once at a few of their stores over the years. Most recently I had similar experience, some of my bags were still at the cashier's station after I left the store; I had a lot of bags. I got home and found nearly thirteen items missing, small items that probably didn't add up to more than $25 dollars and would fill just two bags. crafting supplies mostly. Customer service person said they had the items and I could come back and get them. Easier said than done, I had to go back the next day and wouldn't you know it, instead of holding my items at customer service, or maybe because they were just so disorganized, they couldn't find them behind the desk, I had to go hunt down all the items myself and bring them back to the customer service desk. You should have seen the line when I got back to the customer service counter, it was so long, I was not having it, I walked up to the front and said it wasn't fair for me to have to wait in line again and they serviced me.
I find sometimes, when the cashiers and customers are in a hurry, some of the cashiers don't turn that spin thing all the way around or around at in some instances and you end up leaving without your bags because you didn't realize, way on the other side facing the cashier, you still had bags with your items in them. You would think the cashier would make sure to spin the thing with your bags around so you can see the items. I pay better attention since that last time, but, it almost happened to me a couple more times since if I hadn't made and extra effort to spin the wheel myself as they weren't paying my bags one bit of attention and had already moved on to the next customer before I could collect my packages.
I'm grateful, they have the policy that they will give the benefit of the doubt when one has a receipt, there are other stores that do the same, but, they do the math, if they find it to be more likely customers make it up and causing their bottom line to fall to a negative, you better believe the policy will change to some degree. However, receipt and found items at the store is a guarantee you will get your items that's an even exchange.