I bought the collector edition 2 days ago and received every content that come with it except for the 4 skins.
Tried restarting and re-enabling the dlc but the skins are still not present.
Could you reach out to us at https://fatshark.se/support, please? 
Just sent a request with every info. Hope this will work.
Received everything after contacting support service. Thanks Fatshark.
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