@foone Actually not that uncommon. I've found similar stuff at least twice. My dayjob is to maintain an in-house embedded Linux distro for our IoT devices. I regularly get to mess around with the newest pi compute module base white label hardware platforms. So I know what they look like and how to get the SD card out or dump the emmc, if I find one in the wild.
Best thing that I found so far was an image with an IDE, git repo of the product and many other repos that person worked on still on the card.