Muchas gracias for the feedback and insights.
I recognize that I took a risk in paying as a gift, and kathymack is correct to point out that I'm SOL as a result. In this case, since I did receive my product (most of it, anyway) and it arrived quickly, I would not have disputed the transaction anyway.
In general, however, it's better to be cautious. I have a lot of faith in human nature, which often manifests as naivete.
For the record, I don't think the seller deliberately shortchanged me. I believe it was an honest mistake, which could have been handled better but c'est la vie. In the future, I will ask for pics if they're not already in the listing, thereby eliminating any uncertainty. Likewise, I will include pics in my own listing, to ensure that I don't make the same error in judgment.