okay to delete stuff in /usr/tmp

[joe at actionline.com]

Seem to have a lot of old stuff (old file date garbage?) in /usr/tmp.
Is there any reason I should not delete any of this old stuff?

-rw------- 1 root         48 Jul 26  2011
dkms_rpm_safe_upgrade_lock.11831.TBQyoK
-rw------- 1 root         56 Jul 26  2011
dkms_rpm_safe_upgrade_lock.11831.GIqT1u
-rw------- 1 root         61 Jul 26  2011
dkms_rpm_safe_upgrade_lock.11831.ZdFFpR
-rw------- 1 root         48 Aug  4  2011
dkms_rpm_safe_upgrade_lock.31420.iZaAkD
-rw------- 1 root         58 Aug  4  2011
dkms_rpm_safe_upgrade_lock.31420.uAXaLC
-rw------- 1 root        155 Aug  4  2011 init.5UFrQu
-rw-r--r-- 1 root     766966 Aug  4  2011 index.html
-rw-r--r-- 1 root        216 Aug  4  2011 lomanager-install.log
-rw------- 1 root         56 Aug 10  2011
dkms_rpm_safe_upgrade_lock.11278.MvLRdl
-rw------- 1 root         87 Aug 17  2011 init.CkseTK
-rw------- 1 root         58 Sep  7  2011
dkms_rpm_safe_upgrade_lock.7730.HPMuoC
-rw------- 1 root         48 Sep  7  2011
dkms_rpm_safe_upgrade_lock.7730.g2msVI
-rw------- 1 root          0 Nov  6  2011 init.EjTmLP
-rw------- 1 root          0 Nov  6  2011 init.SbAMmV
-rw------- 1 root         48 Dec  3  2011
dkms_rpm_safe_upgrade_lock.13009.odxfw4
-rw------- 1 root         58 Dec  3  2011
dkms_rpm_safe_upgrade_lock.13009.lVSXdy
-rw------- 1 root         56 Dec  3  2011
dkms_rpm_safe_upgrade_lock.13009.0QjKdM
-rw------- 1 root         87 Dec 19  2011 init.HX5yFo
-rw------- 1 root         87 Dec 19  2011 init.n2hBHn
-rw------- 1 root         48 Dec 19  2011
dkms_rpm_safe_upgrade_lock.5500.FxD1fL
-rw------- 1 root      16346 Mar  6 16:04 076f94f61d77d
drwx------ 2 joe        4096 May 26 08:17 acroread_500_500
-rw------- 1 root      16346 May 30 16:08 05e004fcfefe6
drwx------ 2 joe        4096 Jun  5 17:35 gpg-rhKeMO
drwx------ 2 joe        4096 Jun 20 11:38 gpg-4qjsVm
-rw------- 1 root         56 Jun 29 16:43
dkms_rpm_safe_upgrade_lock.22022.eJT06b
-rw------- 1 root         58 Jun 29 16:44
dkms_rpm_safe_upgrade_lock.22022.hLYGR9
-rw------- 1 root         48 Jun 29 16:45
dkms_rpm_safe_upgrade_lock.22022.S6fvcw
-rw------- 1 root         61 Jun 29 16:47
dkms_rpm_safe_upgrade_lock.22022.cywVtp
drwx------ 2 root       4096 Jul  3 14:05 kdecache-root
-rw------- 1 root     119826 Jul 10 08:15 066f25009bd33
-rw------- 1 root      25382 Jul 10 08:16 066f25005ef46
-rw------- 1 apache 44216320 Aug  1 04:02 core.4622
-rw------- 1 apache 44216320 Aug  1 04:02 core.4621
-rw------- 1 apache 44216320 Aug  1 04:02 core.4620
-rw------- 1 apache 44216320 Aug  1 04:02 core.4625
-rw------- 1 apache 44216320 Aug  1 04:02 core.4624
-rw------- 1 apache 44216320 Aug  1 04:02 core.4623
-rw------- 1 apache 44216320 Aug  1 04:02 core.4626
-rw------- 1 apache 44216320 Aug  1 04:02 core.4619