Forum:How do I (can I?) reinstall add-on content for PS3

With patch 1.05 (PS3) updated on Apr 25 this site says to reinstall DLC since some items included in the DLC may disappear. I bought Fallout New Vegas new from Game Stop with the Classic Pack and my Vault 13 stuff is missing (like my Canteen which really helps out in Hardcore Mode).

Would making an external save of my latest game save from the PS3 HDD, and then erasing my save data and then copying from my ext HD back to the PS3 return my missing Classic Pack items? Never had to do anything like this before. Thx

Also, if I do re-D.L. the Classic Pack, I can't until PSN is up and running. Figures, I hardly use PSN and now when I might need it - POOF!