Thnks to everyone who resonded as it gave me an idea of what is the proper tipping amounts, to the mail delivery person and the paper delivery person.
The paper delivery person left a Xmas card with her address label. I thought it was nice, in the correct person would receive it, because I was concerned a fill-in person might deliver on a day, I gave a gift. The gift went directly to her home.
I left the P.O person a gift this morning via a check made out to cash, (didn't know his/her name), and put in my mailbox for pick-up. Fortunately for me, the P.O. person, (subcontractor), was at the mailbox this morning and I handed her gift into her hand, in an envelope, along with a Xmas card. Again, I didn't want a fill-in person to get the gift.
Even though they might not acknowledge your gift, it seems like it is appreciated as people have families to feed, and needs for their children to fulfill.
Thanks Red, for the suggestion to put a gift for these delivery people just after Thanksgiving, so they can plan ahead, and utilize these funds accordingly.
After all, everone has to eat. I also like the joke punchline, "I like to pay my bills with a smile, but unfortunately, they want money.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).