How do I confirm the validity of a bench warrant?

Question Details:

Received a notice to appear on warrant yesterday in the regular mail form LA county sheriff's dept. First, not clear on why I received it? Can a collection company get an arrest warrant for an unpaid debt? Second, the letter is on plain paper, no LA county letterhead of any kind. The address to report to is crossed out in pen with an alternate address stamped in. Does that sound like a customary practice? Trying to determine if this is some scare tactic from the collection agency or if its real. Never had legal issues before.

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