Using a scale, the box of bricks, and the object, keep putting bricks or pieces of bricks until the scales balance. Find out how many bricks you put and multiply by the mass of one brick and you got the mass of the object.
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Weight is measured in Newtons, whereas kilograms measure mass. So, if your question was about mass, two bricks would have a mass of 4 kilograms.
They both have the same mass. A kilogram measure mass regardless of the material, volume etc.
Mass= Kg (Kilograms) Weight= N (Newtons) or if your measuring volume, then it would be: cm3 (Centimeters Cubed)
If you can destroy the box its easy. Cut a small piece from the board. Trim it to a regular shape such that you know the formula for its area : a rectangle is probably best. Measure the sides of the piece in metric units and convert these to metres (1 cm = 0.01 m, 1 mm = 0.001 m). Calculate the area in square metres. Measure the mass of the piece, and convert to grams, if necessary. Mass/Area = gsm. If you cannot damage the box, the area becomes much harder to measure. You need to measure all the sides, but also all the overlaps. Add all these area together. Divide the mass of the whole [empty] box by its total area.
The international (SI) unit of mass is the kilogram.