i put them in a 10% bleach solotion but to me it just doesnt seem like they are clean one piece is kinda chipping and i dont know if it has termite damage or was rotting
Try soaking it again. If you use more than a 10% bleach solution just make sure you soak it again in plain water and let it dry real good. Then smell it for some aroma. Repeat if necessary.

would it be alright to just wash Roxy's carpet and put it in with the new snake ??
I would, if "Roxy" is healthy. Just wash it in a 5% bleach solution and then rinse it and dry it before hand.

i hear that boas like to climb
Not RTBs. Not that I have ever saw. They will a little bit, maybe, but mine never did so I switched them over to tubs...