Bauer JR II/PB-E1 question

I have a chance to buy a 2005 Bauer JR locally. They want $1,000 and say it has only been used to fill 5 bottles, but it does not have a motor with it (said it was on a boat), just the compressor with an electric clutch and dryer. There is not way to really test it, but what should I look for? Hard to tell if it will reach 4000+ psi when it can’t run . Also does that seem like a reasonable price?

thanks!!!