To find your place's Parcel Key just drop this script into a new object and Touch.

default
{
    touch_start(integer total_number)
    {
        list details = llGetParcelDetails(llGetPos(),[PARCEL_DETAILS_NAME, PARCEL_DETAILS_ID]);
 
        llSay(0, "Below is your requested information.
        \nParcel Name: " + llList2String(details, 0)
        +"\nParcel Key: " + llList2String(details, 1));
    }
}