Bilstein has a limited lifetime warranty. If you know who you got them from, see if they can provide you with a copy of the invoice.
https://bilstein.com/en-us/warranty/

 

I contacted both Bilstein and the place I ordered them from. Bilstein mentioned that I would need to go through them and see what they could do. I'm waiting to hear back. I purchased them in March but didn't install them until the end of May.

 

UPDATE - The place I purchased them from is going to open a warranty claim on my behalf. I just need to take some photos and a video plus fill out a form and send it back. Hopefully it will be taken care of.