I received the Economist as if it were sent to me by fourth class mail.

It was just laid on the table where advertisements we get are laid.

But the only issue of those 3 issues in March I just received since March 2nd is the current, March 23rd.  Economist sends me the magazine via first class matter, not fourth class.  They have told me. 

I cam see the likelihood of mail tampering but now in the delivery to my address.

This is no small matter, though it seems so.   It came within the time the Economist told me we the delivery time for this week's arrival.