Danae,
The documents are folded to allow the address to show through the window of the envelope. Folding it into equal thirds would allow the bottom line of the address to slip below the viewable area.
Are your COLB receipts folded in the same manner? Please hold on to those two receipts. I’ll explain later.
The printing and postmark on your envelope are consistent with mine. I believe that your documents are valid.
Yes, the other receipts are folded in a similar manner. They are a little offset as well. However, those have been folded back and forth and I have had them a lot longer. The newer one I kept folded in the same direction.