BALTIMORE (WJZ) — The mysterious seeds from China showing up in mailboxes across the country, including in Maryland, are likely part of a “brushing scam,” the U.S. Department of Agriculture said.

Officials said a scammer likely got the recipients’ names, addresses and Amazon account information and used that to post fake reviews about the company to boost sales.

READ MORE: Gervonta Davis' Longtime Trainers Sit Down With Rick Ritter Ahead Of Staples Center Fight

Credit: Maryland Department of Agriculture

Officials Warn Of Unsolicited Seeds Sent From China To Americans, Including Marylanders

READ MORE: Poinsettias, Trains Help H.P. Rawlings Conservancy Get 'Back On Track'

It’s still not clear what type of seeds are being sent. The USDA said it’s still in the process of testing them to see if they could be of concern to the environment.

Anyone who got the seeds should check their credit report and change their online account passwords.

MORE NEWS: Essex Spreads Holiday Cheer With Christmas Tree Lighting

Officials ask anyone who has the seeds to hold onto them and reach out to their state’s agriculture department.