Shop Issues

[Skill]

Skript Version: 2.2-fixes.v8b
Skript Author: Njol
Minecraft Version: 1.8.8
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I can't use the format as I've deleted most of my nonworking code in this by now. However, here's what I'm trying to do.

I'm making a Chestshop, and the issue is I'm unable to check if a chest has a specific item. The chest is a variable set from a sign-click event. Here's the code I do have.

on right click on sign:
    if line 1 of event-block is "&8[&2Sell&8]":
        set {_Item} to line 2 of event-block
        set {_Price} to line 3 of event-block
        set {_Player} to line 4 of event-block
        set {_Item} to uncolored {_Item}
        set {_Player} to uncolored {_Player}
        replace all "$" with "" in {_Price}
        set {_Price1} to uncolored {_Price}
        set {_Price2} to {_Price1} parsed as an integer
        set {_Item} to {_Item} parsed as an item
        set {_Player} to {_Player} parsed as an offline player
        if {_Player} is "%player%":
            send " &cYou can't use your own shop!"
            stop
        set {_Block} to block behind event-block
        if {_Block} has enough space for {_Item}:
            set {_Bal} to {_Player}'s balance
            set {_Bal} to {_Bal} parsed as an integer
            if {_Bal} is greater than {_Price2}:
                loop all items in player's inventory:
                    if loop-item is {_Item}:
                        remove 1 of loop-item from player
                        add {_Item} to {_Block}'s inventory
                        console command "eco give %player% %{_Price2}%"
                        console command "eco take %{_Player}% %{_Price2}%"
                        send " &rYou sold 1x &c%{_item}%&r to %{_player}% for $%{_price2}%!" 
                        if {disableChestAlerts.%{_Player}%} is not set:
                            send " &e&l%player%&r sold you a %{_item}% to your shop! &7(- $%{_Price2}%)" to {_Player}
                        set {_Sold} to true
                        stop loop
            else:
                send " &rShop owner has insufficient funds!"
                send " &e&l%player%&r tried to purchase from your shop, but you have insufficient funds!" to {_Player}
                stop
            if {_Sold} is not set:
                send " &cError: You don't have any %{_Item}%!"
        else:
            send " &cThis shop is full!"
    else if line 1 of event-block is "&8[&2Buy&8]":
        set {_Item} to uncolored line 2 of event-block
        set {_Price} to uncolored line 3 of event-block
        set {_Player} to uncolored line 4 of event-block
        #
        set {_Chest} to block behind event-block
        set {_Inv::*} to inventory of {_Chest}
        set {_E} to inventory of block behind event-block

(The issue is under the Buy. I've tried setting "block behind event-block" to a variable and trying these

if inventory of {_Chest} contains
if {_Chest} contains

and more, but to no prevail

 

[Deleted member 5254]

set {_Chest} to the block behind event-block
    loop all items in {_Chest}'s inventory:
        if loop-value is something:
            #do something