The e-mail was sent through backerkit and allowed to add the enclosure and some tools to your order. Title was: “Response Needed – Get your reward for Snapmaker 2.0 Preorder - EU - A250, A350”
Not sure if they are still using backerkit for this. And if they are, if they have already sent those out for the more “recent” orders.
You should check the statuspage (see this sticky: Pre-order shipping update (October)) with your order number.