If cards were shipped separately, $3 is not an unreasonable shipping rate.
Whether the bubbles were torn en route is worth the benefit of the doubt.
If the card was destroyed, that's a different story.
At worst . . . neutral. But keep in mind that a neutral and a negative are about the same as far as eBay is concerned.
As a result of 2016 USPS Price Increases:
* I will no longer ship internationally for trades valued under $200 USD.
* International buyers are responsible for the full cost of shipment, which will now be around $15.