By what is posted on the website I am not sure they will refund or reship your SOUVENIR purchase, maybe contact them and let them know that the seeds in your display case can't be used for DISPLAY because they are crushed, they may help you out.
When buying from a seed bank make sure they have a guarantee against all shipping mishaps (non-delivery, damaged goods), and crush proof tins, vials, and other packaging items will help your goods to arrive safely; ask for these things next time before purchase.
good luck in getting your damaged goods replaced.
regards,