Could well be. The picture is really inconsistent. The majority of reissues has no complete credits and dates, but there are a few listing them.
I'm currently reading Max Salazar's book, Mambo Kingdom, which I heartily recommend as basic introduction into the US Latin music scene from the early 20th century on. He tells about a warehouse holding the archive of Gabriel Oller, one of the most important figures in promoting and recording the music. His nephew knew nothing about the value of the thousands of 78rpm and contracts with full details his uncle has kept, had it all dumped and the building demolished. A devastating story.