If I go to the police station to pick it up what might happen...?
You might want to meet with a lawyer before you do anything.
The basic rule regarding final pay in Massachusetts is: 1) An employee who is terminated involuntarily must be paid in full on the day of discharge.
2) An employee who quits a job can be paid on the next regular pay date after his or her departure.
The text of the law is, "any employee discharged from such employment shall be paid in full on the day of his discharge." M.G.L. c. 149, § 148. And the rule includes any earned vacation pay due "under an oral or written agreement" and any commission that is "definitely determined and has become due and payable."
The law allows for treble damages if the terminated person isn't paid within the 24 hour window.
The law says nothing about meeting the employer's representative at a police station, or allowing the former employer to dictate where the person must receive the money owed.
These lawyers have a solution, as do other lawyers, contact one and get the ball rolling, find out your rights.
Getting Help with the Mass AG Wage Complaint Form – Massachusetts Wage Law
You also need to talk to a criminal defense attorney ASAP.
Don't get blindsided, as there will be hell to pay.
Get ready now.