If you tell your visitors that you have only had 2 refunds out of 1000 orders, your visitors will most likely think that people who purchase your product are happy with it. If you have a 30–day unconditional guarantee (full refund), and if very few people have asked for a refund, you should tell the world about it.

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A lot of digital products, like products you can buy from ClickBank, they have a 30–day full guarantee. A lot similar to the one provided by Affiliate Silver Bullet. Just look at the bottom of the page:
Gain access to the Affiliate Silver Bullet System right now, and put it to the test for the next 30 days. If you don’t see a huge profit jump by then, you can cancel at any time during your first 30 days, and get every cent of your money back. After that you can cancel at any time and never pay another penny! No hassles and no questions asked.
If very few people have asked for a refund, you should use it as a marketing strategy to tell the world about it. It means that your buyers are very satisfied with your product. And the more people who are satisfied with your product, the more people will probably buy it. It’s a lot like word-of-mouth marketing. Most people love to read reviews about products, and most people would like to hear from people who have already bought the product, just so they can be sure that it works before they spend money on it.
If very few people have asked for a refund, you can tell the world why they asked for the refund. If the refund reasons are not directly related to your product’s performance, then you have nothing to lose by telling. For example, you can write that “one guy really liked my product but needed to ask for a refund because of financial hardship that came up”.
The refund marketing strategy is very easy to use. Tell the world about the few people who have asked for a refund, and why so few people have asked for it.