I don't expect you to see them. They were sold in a confection shop, not packaged. They came in both dark and milk, and in raspberry jelly for sure, maybe also in orange and strawberry.
When I asked (we're talking 30 years ago) the shop owners about them, of course they wouldn't tell me because they wanted me to buy from them. All they would say was that they were made by a chocolatier in the midwest. I believe it was a company, not an individual, but who knows. They were sold year round, not just for Valentine's Day (though they were heart shaped).
Anyway, sweet of you to take up my quest!