Where can I get Warranty Void if removed stickers for XBox Classic?

Find original Warranty stickers for Xbox Classic Crystal. Where can you get them?

Nope actually not

If at all, then at the manufacturer. However, I doubt that they just sell like that. After all, it is a seal that decides on possible warranty claims.

In addition, the question would be why you need the sticker. Do you want to send the console in under warranty or resell it? With the former, it would be fraud. The latter also, depending on the design and circumstances.