How do I get list box id in my form collection key values?

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MVC3

I am submitting books issued to students in form.for that i had kept one list box in that for issuing multiple books for same student,when i submit form. in post method i use form collection class to retrieve all values from form,when i check form collection key values it displays all fields id's but list box id is not showing in form collection key's.

What I have tried:

here the code which i used in view to display list box in the form
$("#FieldListTable").append('

<input class="addNewButton" style="float: left; margin-left: 0px;" type="button" value="Add" id="btnAdd" /><input class="addNewButton" style="float: left; margin-left: 0px;" type="button" id="btnRemove" value="Remove" />

BOOkS LISt @Html.ListBox("LstSignInAuthority", Enumerable.Empty<SelectListItem>(), new { @id = "LstSignInAuthority", style = "width:200px;height:130px;" })

');