Where is DPO AE 09892-9997?

DPO is actually the abbreviation for Diplomatic Post Office, not Discontinued Post Office as suggested. It is used by Embassies and consulates overseas. Also, the AE stands for Armed Forces Europe, not Army Europe.

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From the structure of your question I assume you're looking for a former APO military location.

From what I've learned in a similar search, I believe the "DPO" is the abbreviation for "Discontinued Post Office". The "AE" definitely designates "Army Europe" and the "09498" part of your query would be the APO zip code for a former military installation.

For instance, "DPO AE 09742" would refer to the former APO 09742 zip code that was assigned to the Berlin Brigade in Berlin, Germany, but has since been discontinued due to the brigade's having been detached and reassigned.

If you are still in need of locating the exact location, I might suggest you locate someone who was assigned to the military installation that used the APO zip code.