[okie01]

[What I'm really asking is: Was it large enough to hold envelopes?]

Suggesting that the envelopes would have been prepared in an Iraqi lab...and all Atta (or his confederates) had to do was drop them in a mailbox.

The accompanying note paper was cut out of larger sheets (w/scissors?), for no apparent reason -- suggesting that there probably was a reason.

Could it be that they needed to disguise that the notes had been written and copied on European standard sheets (R-4, instead of 8.5 x 11.5)?

[Mitchell]

The accompanying note paper was cut out of larger sheets (w/scissors?), for no apparent reason -- suggesting that there probably was a reason.

Good point.

Could it be that they needed to disguise that the notes had been written and copied on European standard sheets (R-4, instead of 8.5 x 11.5)?

Yes, quite possibly.