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I am sorry to hear about this situation. Assuming that this is the IRS, then what someone in your situation has to do is to get their paid representative to call the agent running the audit (or whatever the matter is) and ask if you have been subpoenaed. It is not uncommon for people being audited to be subpoenaed, and a subpoena has to be sent to the person, and not to their representative. This is why it likely went to you directly. It is not unusual for IRS agents to subpoena people being audited, etc, without prior notice - it is at their discretion. One would then have typically a few weeks to respond with the paperwork requested or object to it in federal Court.
If this is a civil matter, then one may be able to find out what this is about if the case is IN THE JURISDICTION where you live. If you tell me what city/town and county this is in, I can tell you where to look.
However, I wager that it would be a big coincidence if this was anything else other than an IRS subpoena, given what you have told me.
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