I understand that, but are you 100% sure that they are not "running".
I brought this up on the Freenode #dreamhost IRC channel last night, and though I'd share part of the discussion here.
[22:08] <G> thats when the directories were created....
[22:08] <G> tell them to look at say .snapshot/Maildir/cur
[22:08] <G> errr
[22:08] <rlparker> not for me ... created yesterday ;-0
[22:09] <G> .snapshot/hourly.0/Maildir/cur
[22:09] <rlparker> I *do* think the guy is prolly looking at the wrong date
[22:09] <Sabrejack> the snapshot directories are not normal unix directories
[22:10] <Sabrejack> they're virtual-ish, made by the filers. they're built from diffs
[22:11] <G> http://pastebin.com/da22ffac
[22:13] <rlparker> G: so ... no change of data, no updated timestamp?
[22:13] <G> look at the Access dates
[22:13] <rlparker> Yea, I saw that
[22:14] <G> and the contents are correct for those periods