$500 and up is grand larceny, a felony that could get him up to 10 years and/or a fine of up to $10,000.
Though I suspect since you got it back that the authorities might not prosecute.
Might help if you can document other items that he has that belongs to you.
Might also help if they charge him with vandalism or B&E in addition to the theft.
No way to predict. You know your local situation better than I do.
A civil suit against a doper criminal is likely to be a waste of time.
Yes, but depending on the circumstances, they might be held against him.
Again, no way to predict whether your local authorities are going to come down on him, or to what extent.

