You mean the black one with the gold lid? I happen to have another one that I no longer need. Just send me your email address/message and you can have it.

Hi,

on our support page you will find instructions on what to do if you have lost the charging case or an earphone?

Sony Europe

Thank you very much for this nice offer. The only problem is that the XM3s were stolen a while ago and I had just replaced them with the XM4s. And I've already lost the case of the 4s again. So now I actually need the XM4 case. Apparently it's just not meant to be between Sony and me :D But I was hoping that maybe owners of the XM3 headphones, which have been on the market for a while now, have already found a way to get spare parts. Unfortunately, there's no information about it here on Digitec and I haven't found anything trustworthy via Google either ...