True, though notes may be kept forever, why on earth would one want to? Rather, toss them since they're rarely anything worth keeping. Unless they're true, like this one, for instance. Evermore, should you keep it.
Forever. Or a week. Unless you decide to toss it sooner. Lay it aside until you decide.
Check in the left pocket of the trunk. Here you might find photograph. Elsewhere, you might find notes I've saved from you. Among them, one you wrote when I was four, inside a birthday card. This one someone else must have saved. Even I wasn't collecting things at that age. Remember writing the message?