I am looking for a outline highlight for Money Bundle/Wrap (Loot : loose item, not the Melee) for Payday 2

I've try to edit using assets\mod_overrides\mymod\units\world\props\bank\money_wrap\money_wrap_single_bundle.material_config without any success.

Sorry, I don't much about modding.

Can some kind soul help by getting one done ?

I am a bit obssessed with getting all loose items in heists.

In some heists, I cannot find the outstanding money bundles e.g. in Panic Room, I always still have around 13 Money Bundle missing (shown in WolfHUD). So, I hope this mod can help me.

my non-working code for the config file is:
<materials version="3">
<material version="2" render_template="generic:CONTOUR:DIFFUSE_TEXTURE:NORMALMAP" name="mtr_money_wrap_single_bundle">
<diffuse_texture file="units/world/props/bank/money_wrap/money_wrap_df"/>
<bump_normal_texture file="units/world/props/bank/money_wrap/money_wrap_nm"/>
<variable name="contour_color" value="1 1 1" type="vector3"/>
<variable name="contour_opacity" value="1" type="scalar"/>
</material>
</materials>