A verification cap assembly, comprising: a fastening clip for installation to at least one support structure, having a body portion and a head portion, and a verification cap (200, 300) for verifying installation of the fastening clip to the at least one support structure, comprising: a base member, comprising an enclosing side wall defining an interior space between an open bottom end portion and an open top end portion, configured to retainingly receive at least a portion of the fastening clip during assembly, and a cover member, hingeably connected to said base member and movable between a closed position, lockingly engaged with said top end portion of said side wall, and an open position, disengaged from said top end portion of said side wall, comprising at least one stop member (214, 216) projecting away from said cover member into said interior space so as to define a predetermined restricted space for accommodating at least one component (108, 110) of the fastening clip between said bottom end portion and a distal end of said stop member (214, 216) when said cover member is in said closed position, during use, wherein the verification cap (200, 300) is adapted to enclosingly receive said fastening clip when fastened to the at least one support structure. a fastening clip for installation to at least one support structure, having a body portion and a head portion, and a verification cap (200, 300) for verifying installation of the fastening clip to the at least one support structure, comprising: a base member, comprising an enclosing side wall defining an interior space between an open bottom end portion and an open top end portion, configured to retainingly receive at least a portion of the fastening clip during assembly, and a cover member, hingeably connected to said base member and movable between a closed position, lockingly engaged with said top end portion of said side wall, and an open position, disengaged from said top end portion of said side wall, comprising at least one stop member (214, 216) projecting away from said cover member into said interior space so as to define a predetermined restricted space for accommodating at least one component (108, 110) of the fastening clip between said bottom end portion and a distal end of said stop member (214, 216) when said cover member is in said closed position, during use, a base member, comprising an enclosing side wall defining an interior space between an open bottom end portion and an open top end portion, configured to retainingly receive at least a portion of the fastening clip during assembly, and a cover member, hingeably connected to said base member and movable between a closed position, lockingly engaged with said top end portion of said side wall, and an open position, disengaged from said top end portion of said side wall, comprising at least one stop member (214, 216) projecting away from said cover member into said interior space so as to define a predetermined restricted space for accommodating at least one component (108, 110) of the fastening clip between said bottom end portion and a distal end of said stop member (214, 216) when said cover member is in said closed position, during use, wherein the verification cap (200, 300) is adapted to enclosingly receive said fastening clip when fastened to the at least one support structure.