Hauvers message is correct. The game checks for drow equipment as you enter the underdark exit so if you don't have it with you it won't disintegrate. I don't know how Imoen made it back to Athkatla by herself but she did and with no negative results. When you go to return the Rynn Lathorn dump your drow gear in a chest somewhere. As soon as you've entered the Elven city leave again and then go back for the gear. You can re enter the city through the forest of tethir therefore keeping it all till the final battle. Even stuff in a bag of holding will disintergrate. Bypassing the area entirely is the only way to keep the stuff.
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