By Steve Large

SACRAMENTO (CBS13) — The U.S. Postal Service says mixups like the one that returned a package of marijuana to a Sacramento family they didn’t ship are becoming more common.

CBS13 brought you the story of the couple who received an airtight package of marijuana hidden underneath empty boxes inside a larger box.

READ MORE: Hamilton Fans Evacuated After Fire Alarm Goes Off In Sacramento Convention Center

The Postal Service dropped off the package at the home because it had insufficient postage, and the couple’s address was listed as the return address.

Jeff Fitch is a postal inspector for Northern California, and says his office gets several cases like this a week.

READ MORE: Missing Marysville Teen Carmen Miller May Be Victim Of Sex Trafficking, Police Say

“One of the things we look for is fake return addresses, and unfortunately what they’ve started to do is use real people’s names and addresses,” he said. “It’s a money-making venture for them, and they’re just seeing us as the delivery service.”

A quick search of the web shows what to do to sell marijuana through the Postal Service. Unlike FedEx or UPS, deliveries through the the U.S Postal Service can’t be opened without a warrant.

MORE NEWS: Proposed Campground Expansion At Auburn State Recreation Area Draws Concern Over Wildfire Risk

Whoever put the couple’s home as the return address on the pot package never paid the proper postage, sending it to their home after it was marked unclaimed.