We will try to delcare value dow, but we cannot declare the merchandise as A Gift, here're two reasons:

1. Our logistics system generates shipping invoices automatically and such a degree of customization is not feasible.
2. In the vast majority of countries worldwide, declaring merchandise as a "gift" or "sample" makes no difference whatsoever to the assessment of the value / taxability of the goods at Customs.
(To take one example, in the UK merchandise can be assessed by Customs differently if they genuinely appear to be gifts, i.e. individual items gift wrapped with name tags or a greeting.... but simply stating "gifts" on a commercial-looking shipping invoice won't cut any ice with Customs.)
In cases where we are sending you repaired or replacement products under warranty, we will declare them as such. However that is also no guarantee you will not have to pay import duties or sales taxes upon receipt of the goods.
Import duties and taxes are usually not that bad.