I have a 'mystery item'. It looks like a part of something, but neither my husband or I know what it goes to or what its function would be. We have kept it around because we don't want to toss it and then discover it was a vital piece of ___________. On the other hand its floated around my house for a couple years now with still no known purpose or home, just randomly being put with things we think it could fit with. We have even moved houses with it a couple times!
So, do I toss it and figure if I haven't needed it yet it probably isn't that important? Or do I continue to keep it and hope I eventually discover its purpose? How long do you hold on to a mystery item?