I was able to do it in Level 2(the one where you get coffee.)
Viewing post in The Knowledge jam comments
Good point - there's two ways this can happen, either backtracking at the top of the sandbag lift (in theory the sandbag lift should lock you in the upper portion of the map but this isn't working). The other is simply dropping down before getting the toolbox. One of the gameplay issues that needs fixing, most likely just by dropping down the sandbag lift again.