They must have been able to see something I couldn't on my phone. Is it really the ribs you see and not muscle striations? For some reason Photobucket and my gadgets do not get along. I hate even trying to use it. On my tablet the site repeatedly crashes ever since they updated the site.

It may be worth a call to the source you bought the snake and see exactly what you got and what if anything has been given to the snake, as is any previous treatments.

Testing a sample would be nice to strike those problems off your list but I still believe the issues are more with the setup. Now that you are getting your temps better and you added some security I would leave the snake alone as much as possible to relax and settle in. Do some soaks but other than what is necessary I would leave the snake alone until it settles in and starts to eat regularly.

I would also really work on getting that larger cage sooner rather than later. It will allow you to provide a better environment for the snake to be able to find just the temps its looking for. The one it is in just does not give that many choices.