If you have someone (like a kid or a DH who acts like a kid) ask them to go in and "rearrange" things in your sewing room. Just give them 10 minutes... they're not to trash it up, but to just MOVE things from where they normally are. When you go back to "fix" what they've done, you may find the missing blocks. If your brain get "confused" at the normal suddenly not being normal, you might trigger your memory or accidentally find them. Whatever the case... deep breaths. They ARE there.