Thanks for the earlier replies, I'm in my first couple weeks using this type thing.
Bank referred me to the bill pay organization (I guess it's an outsourced service)- it appeared they are on the hook if something goes amiss. Heard that using them, there is actually increased protection from fraud than using a normal check??... what I hear anyway.
Good thing, I think all is still on the up and up. The lady I spoke with was quite friendly and helpful- a nice change for today's world. She said that they use 3 types of checks (2 predominately) depending on several factors. One they used for smaller amount posts on the day the check is expected to arrive. The second is more like a regular paper check and will post when it hits the bank on return (I believe this gives them more protection and used for larger amounts and other reasons).
So the reason one posted and one didn't is two types of checks were sent, and with holidays and MLK- mail is running quite slow and likely the reason that they haven't been received. Something like that is what I was hoping for.