Report said since 1999 there has been a regulation that any commodites of Taiwan which imported to Mainland China must be labelled as "Made in Taiwan, China", and any violation to the rule will not be allowed.  But the report did not say the commodities of non-compliance had been returned to the senders or confiscaed as a penalty, and a custom officer in Shenzun also said he is not sure how to deal with such a violation.

During the time when the not-so-strictly defined "One China Policy" was a tacit understanding by both sides of the strait, I believe Mainland China might have turned a blind eye to the violations, if any.  Now time has changed; the "grey area" has gone.  I think from now on any imports to Mainland China from the island have to meet a more exacting standard demanded; besides, I would rather believe those products from Taiwan are not indispensable to Mainland China any longer. (Maybe they have never been.) 

Be careful of the existing ECFA that is going to be invalid after coming June, Cai administration.  To continue, or not to continue is a question, a big question to you.