Some things are put away to be preserved and to be taken out again "when the time comes", but somehow that time doesn't come and they are forgotten. If you stumble upon such a treasure, don't treat it lightly - think of what it must've meant to the person who put it there and why they thought it worthy to be kept.
I've been working on this one all week. It wouldn't have taken so long if I had had the time to keep at it. So on one hand, it was tough for me to keep going on something that kept showing me it wasn't finished "just yet" (I don't have much patience, you know), but on the other hand going back to it each day - and letting it sit there without staring at it for too long - has given me the oportunity to see many mistakes before they became real problems.