A letter that ends with its better late than never

 Dear, Anna

            You've moved away but your still my best friend.  A lot has happened since you left. My big brother Joey finally went to collage, and Mom got a good paying job. I'm doing OK in school, or so my mom says. We miss you, but good thing you left because Lily, our bully, just moved in across the street.  I have to go do my late homework, it's better late than never>

                                                    Love, Lou

Explanation:

postards have pictures on them, these pictures are things that may never be seen again. the pictures are a part of our history that shows things. because of this many collectors would pay a lot of money for them.

i read on google they "offer a glimpse into the past"

hope this : )