you could always take it for a test drive never come back and ride it like you stole it.
That whole "I'll leave my car keys and phone with you" test ride/drive situ is always a bit unusual.
There was one bike I was checking out when I was looking, I called the guy up and he said
"Sorry, it's gone man, a learner took it for a test ride this morning, binned it and payed full price"
"HA, oh no, how bad did he crash it"
"Was un-ridable, had to tow it"
AHAHA poor dude. Full asking price for a bike you've already wrecked.
Whoops, back to the topic.
Yeah man, 13000 ks is great! Mine had ~17k on it when I got it, it's just like a new bike.