I'm glad that you rescued him, hope you decide to also get the Russian that they abandoned. I agree with Drago, a lot of times hammys don't chew on their wood toys although many do. A trip to the vet for a health check and teeth & maybe nails trimmed might not be a bad idea. I'd also keep an eye out for parasites, keep an eye on her for excessive scratching.
If you do get the Russian quarantine it to make sure that she is heathy as well before putting them in the same room. What a nice thing to do
