Keep it, but don't use it. It's a thoughtful thing for friends and loved ones to buy you something they know you collect, but any time you buy something for a collector it's usually a bad idea. I'm big into music, and every now and then someone will give me a cd of some generic classical guitar or jazz, unaware I have thousands of recordings, all researched and alphabetized and your chance of getting me a rare recording I'm actually looking for is little better than buying a winning Lotto ticket. Unless you also collect, you don't get it. I go to flea markets every now and then with friends and we go past the tables loaded with the $5 M-Tech knives and cheap fantasy junk, and they're like, "Oh we're gonna leave him here; it'll be a while! Ha ha!" and then look at me like I'm a knife snob because I'm done after a 15 second scan of the plastic neon green handles and 3CR14mov/420a blades. If it's a $5 afterthought, just say, "Thanks" and forget it. If they spent a decent amount and you think it's an accident waiting to repeat itself, you may want to have a conversation with one of them that you know will get back to all of them about what you're actually looking for. Maybe make a wishlist on eBay and print it out (even if you never intend to bid on anything) as a conversation starter, i.e. "Look what I'm bidding on!" Maybe you'll have better luck next time.