I've got about 80 duplicates. Mostly from not knowing what I already have, and buying the same chip again.

The upside? I can compare chips for quality and variations.

Several times I thought I had a nice quality chip, but when compared to an accidentally purchased duplicate, I found the duplicate to be in much better condition.

Also, I have two chips which I am fairly certain are legitimate variations. But I would never have known it if I didn't have two chips to compare.