Has anyone heard of the 2005 silver proof set error?

I was looking on ebay and found someone selling a silver proof set with the treasury seal on the back of the case holding the Sac, Kennedy, ect printed upside down. I looked and mine has this too. Got me wondering how rare this is. Kind of neat. Anyone else have one?

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The name is LEE!
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Ask me no questions, I'll tell you no lies.
"packaging errors", and
will bring a premium, but
they are not rare.
This same thing, and other
variations of it, occur in
proof sets and mint sets
going back to the 1960's......