My question involves criminal law for the state of: Colorado

My boyfriend, who is currently 18, who has a roommate who is 19. The roommate got drunk one night and decided he was going to steal a truck. He has already been to jail on previous charges and his prints are in the system. He made sure to wear a mask and gloves during the theft. After stealing the truck he returned to my boyfriends house and said nothing about the stolen vehicle to my boyfriend.

When driving around in the middle of night (with his gloves and mask on), the police spotted the roommate in the truck. The kid ditched the truck and took off running. And managed to evade the police. Then returned home.

The roommate and my boyfriend look very similar. The cops took the description of the theif. And then went looking for my boyfriend. Who denied any connections to the theft.

The cops say that they found a mountain dew bottle in the back of the truck that had finger prints on it and definitely DNA around the opening. It's possible that my boyfriend walked past the stolen truck and tossed it in there, although he doesnt remember if he did or not. And if he did, there is a link to him from the crime.

I'm concerned that my boyfriend may be sent to jail for being an accomplice to the crime because of that mountain dew bottle. What is the minimum and maximum penalty for this in the state of Colorado?
And how much trouble will his friend be in for the actual grand theft?