Your coworker must have a credit score of about 500 or something.
I know a really good transmission guy who rebuilds those GM tranny's for less than $2000 beefing them up in the process, they're better than new when he's done.
It's really hard to get a 1500 Silverado up to $60K, and that's for a loaded up LTZ on Chevy's truck builder app. Add to that depending on the trim and model they have $8500 in incentives available right now and 84 month financing at 0%. You can even get about $4500 in incentives with the LTZ with the 6.2 engine?
Sounds like the stealer took your coworker for a sucker.