In The Force Awakens,
the Millennium Falcon is insanely easy to steal, considering it hasn't been flown in years.
If it has
been sitting out in the open for so long, why wasn't it stolen, sold, or parted years ago? The ramp was clearly open, and it took less than a minute for Rey and Finn to get it up and running.
under constant guard, and security just fled when the attack on the junkyard happened?
This is made more puzzling when considering that
Jakku is basically a planet of scavengers who make their living parting ships. I'm sure the Falcon still had some valuable components, seeing that dead Star Destroyers still did and it still worked.