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I work for an organisation with probably 20,000 PCs across various sites but they all use the same proxies.
This means that google (and all websites) only see traffic from these IP addresses. This means that there's a fair chance that my login to adsense will be from the same IP address as some adsense clicks.
Will this get my account closed by google or do they go further than IP address i.e. MAC address or browser identification or some other technology?
I would use PHP or some similar server-side script to suppress ads for this particular IP block. If your colleagues are visiting your site for some work-related purpose, it doesn't seem very professional to be showing them ads anyways. But if most or all of the site traffic is coming from this source, blocking the ads isn't really an option and I'd recommend explaining the situation to Google in advance.