If you go into your basement/secret lair there is one on the table or you can put them down outside. You can't buy them to put them in your main house.
If you are talking about My Sims agents DS then she is in the east village and here house is opposite the Tailor's.
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In the thief's hideout
Give them to her.
I find My Sims Agents wii is better, but it doesn't take very long to beat.
You go to the office and kick the table.
Possible flooding
A marshmallow and a apple
Behind the wooden boxes:)
You have to find the secret map
50
1000 miles to get to the island