Online serial number checker for iPhone says my iPhone 7 was made in 1985?

I had traded an iPhone with someone using an app called "OfferUp." I checked the IMEI and everything to make sure it was clean(not stolen or iPhone locked), which it was. We traded and everything was fine. I tried updating my phone to iOS 11, and now my phone says "There's a problem with your iPhone. This phone can't be activated for service. Please contact your carrier or AppleCare." I went to Apple and they said the phone was reported stolen?!
I checked the serial number and it says the phone was purchased on JANUARY 1, 1985… The phone is 33 years old? But its the iPhone 7… Was the phone actually stolen? I'm so lost.
The phone was working fine when I had traded with the person.

It's probably been jailbroken at some point, even if it's been put back to normal with an official flash!

Most such phones are fine when sold second hand. You only find out you've been had at a later date!

It certainly isn't that old, so someone did something to it that caused it to be incorrectly identified.

That was probably in connection with it being stolen.

You got the short end of the stick, but it's your own fault.

You should buy phones, whether new or used, Only from legitimate phone dealers.

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