Last week, I ordered an APC uninterruptible power supply from Newegg. Today, a package was delivered; on the outside of the box was printed Important: This carton contains 2 saleable items. And it did, in fact, contain two of the UPSes I had ordered.
So I called Newegg to return it. After I had finished giving my information for the RMA, I remembered I had two other computers which weren't on a UPS, so I asked if they could just charge me for it. After putting me on hold for a few moments, the customer support rep said, "I talked to my manager, and he says you can just keep it; we won't charge you for it."
So I have a free UPS, and my conscience is clear. Virtue is its own reward, but once in a while it includes a bonus.