Finding AES ciphertext stealing test vectors? I am unable to find any test vector document for AES CTS (ciphertext stealing). 

Can you help me to find some by pointing me into the right direction or at an according reference? Do they exist at all?
Depends on what exactly you need.

Some test vectors can be found in the document "RFC 3962 - AES Encryption for Kerberos 5". If you take a look at page 11, you'll find some test vectors for CBC with ciphertext stealing, using an initial vector of all-zero.

Also, there are test vectors to be found at more exotic places like mozilla.org test vectors for AES CTS. They took the original test vectors for AES CTS-3 (Kerberos) and modified them for AES CTS-1 (NIST).

I'm sure that you favorite search engine will help you pinpoint the rest.