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I have a citi card on my report that I don't remember opening, it has 0 statement balances, no missed payment, and last reported in 2009. The $1000 limit is still showing up and helping my utilization. Should I try to get it off of my report or leave it on to help with my utilization?
yes...
Have you tried calling Citi and explaining that you misplaced the credit card? Perhaps they will send you a new card.
If so, ask for a big CLI while your at it.
And make sure they have your current address...
Are you an Authorized User on someone else's card? That might explain it.