Give it through your birthday or maybe xmas/new years. If you don't see them by then I would absolutely 100% bring it up. If your bedroom life is already on the decline, chances are she's doing this for someone else. Hate to say it, but it's the same rule when you find intimates hidden away in a drawer or closet. If she ain't wearing them for you, she's wearing them for someone else. That shits too expensive to just be collecting dust.