Mysterious seeds have been delivered to mailboxes around the country, including Minnesota.

Heidi Smith said she found some in her mailbox two weeks ago, after she ordered gourd seeds off of Amazon in May.

Since they weren't what she ordered she threw them in a drawer.

Early this week, she saw a warning on social media from the Minnesota Department of Agriculture and noticed her package had the same return address as the one pictured.

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"Our main concern is just not having these seeds get planted and trying to get all of that seed shipped to us to make sure it's identified and destroyed," said Denise Theide, seed unit supervisor.

Theide said the department has received 175 calls regarding similar packages across Minnesota.

People are reporting packages with seeds they never ordered across the country, and experts worry they could be harmful.

"Any new species has the potential to be invasive," she said.

The department is looking at the connection between e-commerce platforms and the packages.

It could be a tactic called "brushing."

Brushing is when third-party sellers write their own fake reviews and send out fraudulent products so they can increase their website's placement in online marketplaces like Amazon and Alibaba.

Cyber security experts said it's easy to ship empty boxes or something light, like seeds.

"It may be a little bit less benign because it is kind of deceptive- you know they are trying to influence their ratings on these e-commerce sites," said Jeremy Straub, associate director of the Institute for Cyber Security Education and Research at North Dakota State University. "That is certainly trying to deceive future consumers but at least that means there isn't a whole lot of danger with the particular product."

Straub and Theide said a personal threat is very unlikely.

"From a recipient perspective, it may as well be random," said Straub

The Department of Agriculture is working on creating guidelines on buying seeds online. Anyone who receives seeds should call the department's "Arrest the Pest" hotline at 1-888-545-6684.