Sealed Orders can be found at a Venatori/Red Templar camp located in Crestwood's Glenmorgan Mine. The mine is situated near the entrance to the cave that leads to the wyverns encountered during the side quest Wyrm Hole.
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There's supposedly an Elven ruin near some Fereldan hamlet called "Crestwood." It may be a dead-end, but Calpernia wants it investigated. Go examine the place for any sign of what we're looking for. Better you spend a few weeks deciphering some miserable Elven statues than risk the Master's wrath.

Note: Sealed Orders
There's a small ruin in the hills above Crestwood. A tiny place, but it's old and elven, so leave no stone unturned. General Samson's orders.
You've been told what to look for, so I expect a report once you're done. Copy down any elven writing you see.
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- This note is not included in the Codex.