unscrupulous users?
.....this seems all to common.
My first one from the east was damaged in transit, it looked like the cardboard box was smunched by DHL, then taped up...with their tape!
The cam still worked ok, but wouldn't articulate smoothly.
Oasis told me to return it to California for replacement. when I responded that is would be $40 to ship there, they just sent me a new one!
Yours has a nice case...unlikely damaged in there!
looks to me like someone bought it, jammed it into a hot cylinder or something, then either returned it, or equally likely, found they couldn't get an image on their laptop or tablet/phone, so gave up, and sent it back.
Sadly a lot of things don't get inspected upon return.
final note: I found the rigid shaft a problem to navigate into cylinders AND plumbing/heating ducts etc. that I've wanted to inspect. If buying again, I'd be tempted to get the flexible shaft one.( $$$)