I hate to post vague, 4th-hand sounding info, but a close friend of mine (valid LTC holder) was just visited by 2 MA state police officers at his house after he had a few thousand rounds delivered from a common online retailer. He didn't let them in nor did they have a warrant, but apparently they are getting tipped off by UPS as to these deliveries and "following up".
Use caution when having stuff delivered to a MA address!
Use caution when having stuff delivered to a MA address!