I'll let someone else handle the price angle; it sounds a little high.
For a checkout, make sure gun is empty, then:
Look for smooth bolt operation. Check for a too-light trigger pull that might indicate tampering. Make sure the safety works properly. Cock the bolt and with the safety on, pull the trigger as hard as you can, then take the safety off. If the gun fires (clicks), trigger reset is defective.
Be sure bolt can be removed and replaced as designed. Check locking lugs for any sign of abuse. If possible, check headspace.
With dummy rounds (or live rounds at a range or safe place to shoot), make sure feed from the magazine is easy and flawless.
You can't test accuracy without shooting the rifle, but either ask to test fire before buying or make sure, in writing, that you can return the rifle if it is inaccurate.
Check the scope for clarity. With rifle on a solid rest, remove the bolt and boresight the rifle with the scope. Make sure the scope can be adjusted enough to boresight.
Good luck.
Jim