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Under Mass. Gen. Laws Ann. ch. 140, § 129C; ch. 269, § 10, you could face up to 2 years in jail and a fine up to $500.
Keep in mind, however, that the police would have to prove that it was you in possession of the firearm. Since they did not catch you with it on your person, that may be difficult to prove.
Have they contacted you about it?
You basically have two options: 1) abandon the firearm and don't respond if they contact you to come pick it up; or 2) pick it up and risk being charged, or at least questioned.
Possession is having care, custody or control over a thing.
A person can own a firearm and not necessarily be in possession of it. For example, if you loaned your gun to someone and they took it out of state where it was not registered, you still own it, but you weren't in possession of it when it was taken out of state.
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