Counterfit issues aside...If you are a foreign registered vessel, the best solution is to actually design a bonded store locker.
This has to have a secure locking system that cannot be tampered with, so that Customs
can Seal closed.
Then any duty controlled items beyond your stated on board allowances can be sealed instead of removed or charged tax on.
will often at request, come back down to open locker and allow you replenish your allowance