Hmm, you have multiple options:
1: you go to cundco.de or carcassonneshoppe.com and order the missing parts
2: you send an email to cundco and tell them that you are missing some parts from it. Here however are two things that are a problem, you ordered it from a chinese company and maybe it hasnt the same publisher, if the box is from HiG you just need to send an email!!
3: you can ask in the marketplace on this forum if anyone have those spare parts.
I hope you succeed
P.s. Cundco.de is the online shop from HiG