Selling cds on Amazon

I have sold several hundred books from a private collection over the last few years along with a few dozen cds. However I now find I cannot list cds, unless I provide invoices from a supplier etc etc, which of course I don’t have. Is there anyway round the Amazon restrictions to allow me to carry on listing the occasional cd.? Cds already listed still appear and I make the odd sale, but I can’t list anymore!