Cisco has a **VERY** high rate of non-returns on eval equipment, so they've had to start penalizing eval sites that don't return the equipment. I know about this, because I worked at a site where my predecessor kept $25,000 in one month eval equipment a little over 2 years. Also kept about $250,000 in Cabletron three month eval equipment for 18 months before Cabletron just gave in and let him keep the stuff (resale value by the time he decided to send it back was <$15,000 so they just took it as a write-off). In fact, he did this to Fore, 3Com, and a couple other networking companies. Anyway, they've all started cracking down on people like this because they were taking huge losses before.
Not that anyone wanted all that info. Just be careful getting in on this. Cisco makes returns easy, but you'd kill yourself if you forgot and went a day over.
RagManX