What would you do?

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Do you consider yourself an honest person? How far would you go to maintain your integrity? We had supplies leftover from updating our bathroom this week but I lost my receipt. We're had a limited amount of time before the invoice was purged from lowes computer system so we took them back this afternoon. My husband guessed we would get back around two hundred dollars although we couldn't remember how much we paid for the wood for the baseboards. Once they found the invoice and scanned what we brought back it came to just under for hundred dollars. Because I didn't have my receipt and didn't remember what we paid I liked it over and discovered a discrepancy on the return invoice. It turned out that they refunded us the whole amount we paid them for the flooring we put in. I checked it once, twice and three times to be sure. Now what, so I let it be and take the freebie it let them know and pay for what we used? I know many would take the freebie and it was tempting because it wasn't out fault it worked out that way. But I went back and paid for what we used. I'm a cashier and I'd want someone to let me know if I undercharged them too. What would you do in that situation? I see a lot of our customers at the grocery store where I work look through their receipt for mistakes in their favor but I wonder if they see something in their favor of they bring that to anyone's attention. Pic is the hanging basket I brought into the house for the night.