Thanks for the warning. If you buy department store gift cards at a supermarket and lose the receipt, the department store may not cover the loss. Make sure you give the gift card WITH the receipt of your purchase to the recipient.
I found this out the hard way. I had received a department store gift card as a holiday gift and (therefore) did not have the receipt. When I went to use it, I was told that the card number had already been used. After a number of phone calls to customer service, I found out that a method similar to the OP had been used to take the total gift amount off the card. The department store said they would cover the loss if I had the receipt. The problem was that I didn't and the friend who had purchased the card was diagnosed with terminal cancer in January and I didn't have the heart to ask for a receipt while she was undergoing chemo and radiation. (Who would?)
Even though the store was well aware the card had been stolen, they would not refund my gift without a receipt. I fought with them, scanned my card and sent it to them as proof, and asked why they were not willing to stand behind a card the KNEW had been criminally accessed and used. Their answer was "store policy."