Hi dmpopof,
I don't know why you don't have logs from messages file, but I suggest to modify you inputs.conf file in
[monitor:///var/log/messages]
disabled = false
index = linuxlog
sourcetype = syslog
In this way you're sure to have only the last logs and not the oldest.
if you want also the oldest (but I see that you already have) you could use
[monitor:///var/log/messages*]
Bye.
Giuseppe
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