Sticker Mule have apologized thoroughly. It was apparently an engineering error in multiple instances, from letting me add a clear cut sticker in the first place, to sending out shipping notices when they actually intended to cancel orders. They have restored our sticker, this time as a die cut with white border: https://www.stickermule.com/marketplace/18010-mastodon-fluffy-elephant-friend
Also, I will still receive 100 items of the clear cut stickers I originally ordered.
@Gargron Sticker Mule is the bomb! I've created several stickers with them. The most recent is https://www.stickermule.com/marketplace/17605-programming-badges