Might have been the other way around too.
Such errors in distribution are common (to the degree errors occur).
No one is saying otherwise. The POINT is that if you look at ALL THE FACTS, the FACTS say that it didn't happen that way.
You just apply these "possiblities" as if they mean something. You say the return address ZIP code on the senate letters could have been written in reverse because Arabs write from right to left. So, they could have accidentally written 08852 when they meant to write 25880.
Yes, that is "possible". But if you look at all the facts -- which you do not seem able to do -- you can see that that "possibility" is also absurd, ridiculous and preposterous.
It would imply that they somehow made the SAME mistake on the return addresses on BOTH senate envelopes but did NOT make the mistake on the ZIP codes in the to-addresses.
It would mean that they accidentally ended up with a ZIP code that was for a town that just happened to be five miles from the town used in the return address.
Instead of dreaming up these totally absurd "possibilities" which prove nothing except that you know all the mistakes that the post office can make, why not do something constructive? Why not try to explain why al Qaeda would even bother to create a FAKE school address on the senate envelopes? Why not use a REAL school address?
They seem to have deliberately used the name of a school which looks real but which DOES NOT EXIST anywhere in New Jersey. They used a real town name, but they used a ZIP code for a different town. WHY?
And if you answer, PLEASE try to look at ALL the facts, don't just look for some totally absurd possibility which fits your beliefs.