Another what year polaris do I have
 

To make a long story short. I bought an ATV from a local guy. It does not have a VIN. A long time ago it was a police 4 wheeler that was used by a local PD after confiscation. It has been registered before using the transmission serial number.
I was told by the guy that it was a 2000. But ordering parts for it, the airbox looks like it is from a 1998.

Is there any way to tell?

Welcome to the forums. :)

Do you know what model it is? That may help some.

There's always the, cut it in half and count the rings, option. :p

If it still has an engine sticker the first two digits are the year model. Such as 98xxxx.