Are my rear shockers shot?

So I bought a cheap car to fix up. It's a 1993 Nissan Bluebird U13, That's a Nissan Altima first generation to you Americans. ;-)

I'm making a list of parts to replace.

I just bounce tested the rear end with strange results.

First bounce is too quick, like shot shockers, then if you bounce it again it stiffens right up, feels like good shocks! Just that first bounce that is loose, It's like the shockers pressure themselves up. Weird.

So are they shot or some sort of pneumatic shockers i'm not familiar with?

Oh, and it drives fine, rear end is straight and true, tyres remain in good contact with the road.

confused.