This log isn't appended but replaced as it would quickly grow very large. So unfortunately you only se data for the last scan.
I'm not sure if this Ignore is something that gets carried over for every anti-rootkit scan or just that one. If it isn't then the detection may have been corrected in a VPS update, though there is no way to tell without information about the detection. So we are unfortunately in the chicken and egg scenario.
As for your planned action of if you could un-ignore it and delete it next time it was detected, that would really be even worse than the situation your in. Deletion isn't really a good first option (you have none left), 'first do no harm' and investigate right away not 8 days later.
To be sure you haven't got anything malicious hidden, you could run some other anti-rootkit tools.
Also see, anti-rootkit, detection, removal & protection
http://www.antirootkit.com/software/index.htm. Try these as they are some of the more efficient and user friendly anti-rootkit tools.
- Panda Rootkit Cleaner -
http://research.pandasoftware.com/blogs/images/AntiRootkit.zip.
- Trend Micro RootkitBuster -
http://www.trendmicro.com/download/rbuster.asp- F-Secure Blacklight may not always be available,
http://www.f-secure.com/blacklightRemember, don't react, report.