Does Homeland Security seize suspicious mail?

I read a letter to the editor from a guy who ordered a motorcycle part that was lost in the mail. After an investigation, the cause of the loss was reported thusly:

Does Homeland Security conduct scans of mail? Or is that conducted soley by the Postal Service?

I’ve tried repeatedly to post an answer, but Homeljjhuidyf9ewdcxhbvvl;UFVCHGIOE
SUHUIHouifhalkjhgajghq9pyp98reygpklhgapiuvj.kgjhvqpuioyg

bump

I find it hard to believe that DHS would have anything to do with checking mail. It’s a manpower thing. They are mostly a coordinating agency. The USPS has the manpower, training (and the motive) to check for suspicious packages.

That’s not a very big bolt is it? I find it hard to believe that anyone would have a problem with bolts, and I’ve had plenty of things shipped USPS just this summer with no problems. I’m wondering if it was oily and that’s why they stopped it.