treasure toss but unaccessable sometimes

[Legacy_Knight_Shield]

               I'm using silicone scouts treasure.I have it set to toss.

Problem is sometimes the treasure plops some where unreachable.

Here is the toss script.

//************************************************
//** ss_treas_toss                              **
//**                                            **
//** This function is used to scatter the       **
//** inventory of a creature or chest on the    **
//** ground around it when opened or killed.    **
//**                                            **
//** 1 = toss and destroy                       **
//** 2 = toss and leave                         **
//**                                            **
//************************************************
//**Created By: Jason Hunter (SiliconScout)     **
//**                                            **
//**Version: 1.6c                               **
//**                                            **
//**Last Changed Date: July 17, 2004            **
//************************************************

location IsValidLoc(location lPoint);

void main()
{
    object oInv =OBJECT_SELF;
    object oArea = GetArea(oInv);
    object oItem = GetFirstItemInInventory(oInv);
    object oCreate;

    int iOption = GetLocalInt(OBJECT_SELF,"ss_t_toss");

    vector vInv = GetPosition(oInv);
    vector vSpawn;

    float vInvX = (vInv.x);
    float vInvY = (vInv.y);
    float vInvZ = (vInv.z);
    float vSpawnX;
    float vSpawnY;
    float iVecAdd;

    location lSpawn;


    while (oItem != OBJECT_INVALID)
    {

        //Get a random vecor within 1 and 2.5 meters
        while(iVecAdd < 0.2)
        {
            iVecAdd = d100(1)*0.025;
        }

        if (d4() < 3) vSpawnX = vInvX + iVecAdd;
        else vSpawnX = vInvX - iVecAdd;

        iVecAdd=0.0;
        while(iVecAdd < 0.2)
        {
            iVecAdd = d100(1)*0.025;
        }

        if (d4() < 3) vSpawnY = vInvY + iVecAdd;
        else vSpawnY = vInvY - iVecAdd;

        //set vector
        vSpawn = Vector(vSpawnX, vSpawnY, vInvZ);

        //Set spawn location
        lSpawn = Location(oArea,vSpawn,0.0);

        //validate the location to drop on
           lSpawn = IsValidLoc(lSpawn);

        if (GetItemStackSize(oItem) > 1)
        {
            oCreate = CreateObject(GetObjectType(oItem),GetResRef(oItem),lSpawn,FALSE);
            SetItemStackSize(oCreate,GetItemStackSize(oItem));
        }else
        {
            CreateObject(GetObjectType(oItem),GetResRef(oItem),lSpawn,FALSE);
        }
        DestroyObject(oItem,0.0);
        oItem = GetNextItemInInventory(oInv);
    }

    //Keep the chest live.
    if (iOption > 1) return;

    //if it's not then let the object die
    DestroyObject(oInv);

}

//////////////////////////////////////////////////////////////////////
// Function. Generates a Valid location to place an object
// !WARNING! Make sure oArea is valid. Requires a custom creature
// with Null Human appearance TAG = "Null" ResRef = "null"
// nMinX, nMinY = lower left corner. nMaxX, nMaxY = Upper Right Corner
// Example; location lSpawn = RanValidLoc(oArea,10,10,30,30);
//////////////////////////////////////////////////////////////////////

location IsValidLoc(location lPoint)
{
    CreateObject(OBJECT_TYPE_CREATURE,"ss_nulltoss",lPoint);
    object oNull = GetObjectByTag("ss_nulltoss");
    if(GetIsObjectValid(oNull))
        {
        location lSpawn = GetLocation(oNull);
        DestroyObject(oNull);
        return lSpawn;
        }
    else
        {
        return lPoint;
        }
}