A fire-resistant safe having an inner shell and an outer shell, the shells each having walls encapsulating a space to be filled with insulation material comprising: at least one funnel (41, 42) that projects from the outer shell the funnel having an opening for filling the space between the two shells (10, 11) with insulation material, the opening being surrounded by side walls having exterior surfaces with at least one of said exterior surfaces having a linear locking groove therein, said linear locking groove defining an engagement axis parallel to said linear locking groove an escutcheon adapted for placement over said at least one funnel (41, 42) said escutcheon having a plate surrounded by a rim that encloses an interior space of the escutcheon, the rim having an interior surface adjacent said interior space with at least one rigid locking member on said interior surface projecting into said interior space, said at least one rigid locking member being adapted for placement in said at least one linear locking groove such that said at least one rigid locking member cannot be removed from said at least one linear locking groove except by movement of said at least one rigid locking member parallel to said engagement axis, further comprising at least one insertion groove in said at least one funnel (41, 42) intersecting at least one linear locking groove in said at least one funnel, wherein said at least one insertion groove has a linear portion, said linear portion defining an insertion axis perpendicular to said engagement axis, wherein the insertion groove allows the alignment of locking members with locking groove prior to a lateral movement and insertion of locking members into locking grooves, the safe further comprising at least one stake anchoring element projecting from said escutcheon for anchoring the escutcheon in the insulation material. at least one funnel (41, 42) that projects from the outer shell the funnel having an opening for filling the space between the two shells (10, 11) with insulation material, the opening being surrounded by side walls having exterior surfaces with at least one of said exterior surfaces having a linear locking groove therein, said linear locking groove defining an engagement axis parallel to said linear locking groove an escutcheon adapted for placement over said at least one funnel (41, 42) said escutcheon having a plate surrounded by a rim that encloses an interior space of the escutcheon, the rim having an interior surface adjacent said interior space with at least one rigid locking member on said interior surface projecting into said interior space, said at least one rigid locking member being adapted for placement in said at least one linear locking groove such that said at least one rigid locking member cannot be removed from said at least one linear locking groove except by movement of said at least one rigid locking member parallel to said engagement axis, further comprising at least one insertion groove in said at least one funnel (41, 42) intersecting at least one linear locking groove in said at least one funnel, wherein said at least one insertion groove has a linear portion, said linear portion defining an insertion axis perpendicular to said engagement axis, wherein the insertion groove allows the alignment of locking members with locking groove prior to a lateral movement and insertion of locking members into locking grooves, the safe further comprising at least one stake anchoring element projecting from said escutcheon for anchoring the escutcheon in the insulation material.