Outback Dilemma

I need some advice on what to do. Here's the situation: My S-I-L gave DH a gift certificate to the Outback restaurant a few months ago for his birthday. He gave it to me for safe keeping.

Here's the state of my desk these days:

What you don't see are shelves (and drawers) that are just as cluttered around it. Normally it's not this messy but in the summer I tend to bring school stuff home for safe keeping and I'm in the process of taking care of end-of-summer vacation business so many appts are being made (Dr.'s, vet, car, hair, etc.) which adds to the clutter.

He's been dropping hints about wanting to use the gift card. I have searched high and low for that damn gift card and I can't find it. CRAP! I know if I tell him I've lost it he'll make snippy remarks(not in a mean ugly way, but more annoying) for the next hundred years about how I lose things and my desk should be better organized-hey I can find things 99% of the time. I mentally divide my desk into the United States and remember things by their location. The highlighting tape? Why that's in Washington (in a basket). The bills to be mailed-Kansas. Get it!?

I remember him handing me the card and I also remember thinking wherever it was put down wasn't a good spot and I needed to move it. I didn't move it..

Soooo...I'm going to look one more time in every possible place. Here's where you come in, if I don't find it, should I just go and buy another one ($25.00) and he'll be none the wiser or fess up?