Has there been an audit?

Yes. We had a pre-launch audit by TechRate, and a post-launch audit completed by Certik.

TechRate audit: https://github.com/Shibnobi/SmartContract/blob/287481dfae99ec86ad73ab4779e06882c2051492/TechRate/Shibnobi%20Audit%20with%20LP%20Lock.pdf

Certik audit: https://www.certik.com/projects/shibnobi