I can pretty much remember every piece, especially if I bought it -- not so much if I got it from someone else.
One time, though, I was looking through my fabric and I pulled a box out from under the bed and almost had a heart attack. It was full of fabric I did not recognize at all! I just couldn't understand it. Then I remembered that I had bought the whole box from a woman who had collected it to do watercolor quilts, so I hadn't actually bought it piece by piece. It was a big relief!
I can remember when/where I bought it and what I planned to do with it. Now if only I actually used up more of it!
Laurie