[CentOS] Rpm -Va output

Hi all,

Between two updates, I have the following difference in the ouptut log 
of the "rpm -Va" command

missing     /usr/lib/rpmdb/i386-redhat-linux/CentOS/__db.001
missing     /usr/lib/rpmdb/i386-redhat-linux/CentOS/__db.002
missing     /usr/lib/rpmdb/i386-redhat-linux/CentOS/__db.003

........C   /lib/ld-lsb.so.1
........C   /lib/ld-lsb.so.2

Does anybody knows why I have these missing files and why libraries are 
modified ?

I there a way with "rpm -Va" to know when the modifications where made ? 
(By adding another option ?)

Thank you,

Jean LEE